Dynamic Host Configuration Protocol (DHCP) and Bootstrap Protocol (BOOTP) Parameters

Last Updated2019-03-19Note

For the Civic Address Types Registry [RFC4776], please see:
http://www.iana.org/assignments/civic-address-types-registry

Available Formats

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Registries included below

• BOOTP Vendor Extensions and DHCP Options
• DHCP Message Type 53 Values
• NetWare/IP Option Type 63 Sub-Option Codes
• DHCP Cablelabs Client Configuration Option Type 122 Sub-Option Codes
• DHCP Status Code Type 151 Values
• DHCP State Type 156 Values
• Altitude Type Registry
• Datum Registry
• GeoLoc Option Version Registry
• CableLabs Client Configuration Option Ticket Control Mask Bit Definitions
• DHCP Relay Agent Sub-Option Codes
• Authentication Suboption (value 8) – Protocol identifier values
• Authentication Suboption (value 8) – Algorithm identifier values
• Authentication Suboption (value 8) – Replay Detection Method (RDM) identifier values
• IEEE 802.21 Service Type (MoS DHCPv4 Address and FQDN Sub-Options)
• NTP Time Source Suboptions
• VSS Type Options

BOOTP Vendor Extensions and DHCP Options

Registration Procedure(s)

IETF Review

Reference[RFC2939]Note

The Bootstrap Protocol (BOOTP) [RFC951] describes an IP/UDP bootstrap
protocol (BOOTP) which allows a diskless client machine to discover
its own IP address, the address of a server host, and the name of a
file to be loaded into memory and executed.  The Dynamic Host
Configuration Protocol (DHCP) [RFC2131] provides a framework for
automatic configuration of IP hosts.  The document "DHCP Options and
BOOTP Vendor Information Extensions" [RFC2132] describes options for
DHCP, some of which can also be used with BOOTP. Additional DHCP
options are described in other RFCs, as documented in this registry.

Available Formats

CSV

Tag	Name	Data Length	Meaning	Reference
0	Pad	0	None	[RFC2132]
1	Subnet Mask	4	Subnet Mask Value	[RFC2132]
2	Time Offset	4	Time Offset in Seconds from UTC (note: deprecated by 100 and 101)	[RFC2132]
3	Router	N	N/4 Router addresses	[RFC2132]
4	Time Server	N	N/4 Timeserver addresses	[RFC2132]
5	Name Server	N	N/4 IEN-116 Server addresses	[RFC2132]
6	Domain Server	N	N/4 DNS Server addresses	[RFC2132]
7	Log Server	N	N/4 Logging Server addresses	[RFC2132]
8	Quotes Server	N	N/4 Quotes Server addresses	[RFC2132]
9	LPR Server	N	N/4 Printer Server addresses	[RFC2132]
10	Impress Server	N	N/4 Impress Server addresses	[RFC2132]
11	RLP Server	N	N/4 RLP Server addresses	[RFC2132]
12	Hostname	N	Hostname string	[RFC2132]
13	Boot File Size	2	Size of boot file in 512 byte chunks	[RFC2132]
14	Merit Dump File	N	Client to dump and name the file to dump it to	[RFC2132]
15	Domain Name	N	The DNS domain name of the client	[RFC2132]
16	Swap Server	N	Swap Server address	[RFC2132]
17	Root Path	N	Path name for root disk	[RFC2132]
18	Extension File	N	Path name for more BOOTP info	[RFC2132]
19	Forward On/Off	1	Enable/Disable IP Forwarding	[RFC2132]
20	SrcRte On/Off	1	Enable/Disable Source Routing	[RFC2132]
21	Policy Filter	N	Routing Policy Filters	[RFC2132]
22	Max DG Assembly	2	Max Datagram Reassembly Size	[RFC2132]
23	Default IP TTL	1	Default IP Time to Live	[RFC2132]
24	MTU Timeout	4	Path MTU Aging Timeout	[RFC2132]
25	MTU Plateau	N	Path MTU Plateau Table	[RFC2132]
26	MTU Interface	2	Interface MTU Size	[RFC2132]
27	MTU Subnet	1	All Subnets are Local	[RFC2132]
28	Broadcast Address	4	Broadcast Address	[RFC2132]
29	Mask Discovery	1	Perform Mask Discovery	[RFC2132]
30	Mask Supplier	1	Provide Mask to Others	[RFC2132]
31	Router Discovery	1	Perform Router Discovery	[RFC2132]
32	Router Request	4	Router Solicitation Address	[RFC2132]
33	Static Route	N	Static Routing Table	[RFC2132]
34	Trailers	1	Trailer Encapsulation	[RFC2132]
35	ARP Timeout	4	ARP Cache Timeout	[RFC2132]
36	Ethernet	1	Ethernet Encapsulation	[RFC2132]
37	Default TCP TTL	1	Default TCP Time to Live	[RFC2132]
38	Keepalive Time	4	TCP Keepalive Interval	[RFC2132]
39	Keepalive Data	1	TCP Keepalive Garbage	[RFC2132]
40	NIS Domain	N	NIS Domain Name	[RFC2132]
41	NIS Servers	N	NIS Server Addresses	[RFC2132]
42	NTP Servers	N	NTP Server Addresses	[RFC2132]
43	Vendor Specific	N	Vendor Specific Information	[RFC2132]
44	NETBIOS Name Srv	N	NETBIOS Name Servers	[RFC2132]
45	NETBIOS Dist Srv	N	NETBIOS Datagram Distribution	[RFC2132]
46	NETBIOS Node Type	1	NETBIOS Node Type	[RFC2132]
47	NETBIOS Scope	N	NETBIOS Scope	[RFC2132]
48	X Window Font	N	X Window Font Server	[RFC2132]
49	X Window Manager	N	X Window Display Manager	[RFC2132]
50	Address Request	4	Requested IP Address	[RFC2132]
51	Address Time	4	IP Address Lease Time	[RFC2132]
52	Overload	1	Overload “sname” or “file”	[RFC2132]
53	DHCP Msg Type	1	DHCP Message Type	[RFC2132]
54	DHCP Server Id	4	DHCP Server Identification	[RFC2132]
55	Parameter List	N	Parameter Request List	[RFC2132]
56	DHCP Message	N	DHCP Error Message	[RFC2132]
57	DHCP Max Msg Size	2	DHCP Maximum Message Size	[RFC2132]
58	Renewal Time	4	DHCP Renewal (T1) Time	[RFC2132]
59	Rebinding Time	4	DHCP Rebinding (T2) Time	[RFC2132]
60	Class Id	N	Class Identifier	[RFC2132]
61	Client Id	N	Client Identifier	[RFC2132]
62	NetWare/IP Domain	N	NetWare/IP Domain Name	[RFC2242]
63	NetWare/IP Option	N	NetWare/IP sub Options	[RFC2242]
64	NIS-Domain-Name	N	NIS+ v3 Client Domain Name	[RFC2132]
65	NIS-Server-Addr	N	NIS+ v3 Server Addresses	[RFC2132]
66	Server-Name	N	TFTP Server Name	[RFC2132]
67	Bootfile-Name	N	Boot File Name	[RFC2132]
68	Home-Agent-Addrs	N	Home Agent Addresses	[RFC2132]
69	SMTP-Server	N	Simple Mail Server Addresses	[RFC2132]
70	POP3-Server	N	Post Office Server Addresses	[RFC2132]
71	NNTP-Server	N	Network News Server Addresses	[RFC2132]
72	WWW-Server	N	WWW Server Addresses	[RFC2132]
73	Finger-Server	N	Finger Server Addresses	[RFC2132]
74	IRC-Server	N	Chat Server Addresses	[RFC2132]
75	StreetTalk-Server	N	StreetTalk Server Addresses	[RFC2132]
76	STDA-Server	N	ST Directory Assist. Addresses	[RFC2132]
77	User-Class	N	User Class Information	[RFC3004]
78	Directory Agent	N	directory agent information	[RFC2610]
79	Service Scope	N	service location agent scope	[RFC2610]
80	Rapid Commit	0	Rapid Commit	[RFC4039]
81	Client FQDN	N	Fully Qualified Domain Name	[RFC4702]
82	Relay Agent Information	N	Relay Agent Information	[RFC3046]
83	iSNS	N	Internet Storage Name Service	[RFC4174]
84	REMOVED/Unassigned	[RFC3679]
85	NDS Servers	N	Novell Directory Services	[RFC2241]
86	NDS Tree Name	N	Novell Directory Services	[RFC2241]
87	NDS Context	N	Novell Directory Services	[RFC2241]
88	BCMCS Controller Domain Name list	[RFC4280]
89	BCMCS Controller IPv4 address option	[RFC4280]
90	Authentication	N	Authentication	[RFC3118]
91	client-last-transaction-time option	[RFC4388]
92	associated-ip option	[RFC4388]
93	Client System	N	Client System Architecture	[RFC4578]
94	Client NDI	N	Client Network Device Interface	[RFC4578]
95	LDAP	N	Lightweight Directory Access Protocol	[RFC3679]
96	REMOVED/Unassigned	[RFC3679]
97	UUID/GUID	N	UUID/GUID-based Client Identifier	[RFC4578]
98	User-Auth	N	Open Group’s User Authentication	[RFC2485]
99	GEOCONF_CIVIC	[RFC4776]
100	PCode	N	IEEE 1003.1 TZ String	[RFC4833]
101	TCode	N	Reference to the TZ Database	[RFC4833]
102-107	REMOVED/Unassigned	[RFC3679]
108	REMOVED/Unassigned	[RFC3679]
109	OPTION_DHCP4O6_S46_SADDR	16	DHCPv4 over DHCPv6 Softwire Source Address Option	[RFC8539]
110	REMOVED/Unassigned	[RFC3679]
111	Unassigned	[RFC3679]
112	Netinfo Address	N	NetInfo Parent Server Address	[RFC3679]
113	Netinfo Tag	N	NetInfo Parent Server Tag	[RFC3679]
114	URL	N	URL	[RFC3679]
115	REMOVED/Unassigned	[RFC3679]
116	Auto-Config	N	DHCP Auto-Configuration	[RFC2563]
117	Name Service Search	N	Name Service Search	[RFC2937]
118	Subnet Selection Option	4	Subnet Selection Option	[RFC3011]
119	Domain Search	N	DNS domain search list	[RFC3397]
120	SIP Servers DHCP Option	N	SIP Servers DHCP Option	[RFC3361]
121	Classless Static Route Option	N	Classless Static Route Option	[RFC3442]
122	CCC	N	CableLabs Client Configuration	[RFC3495]
123	GeoConf Option	16	GeoConf Option	[RFC6225]
124	V-I Vendor Class	Vendor-Identifying Vendor Class	[RFC3925]
125	V-I Vendor-Specific Information	Vendor-Identifying Vendor-Specific Information	[RFC3925]
126	Removed/Unassigned	[RFC3679]
127	Removed/Unassigned	[RFC3679]
128	PXE – undefined (vendor specific)	[RFC4578]
128	Etherboot signature. 6 bytes: E4:45:74:68:00:00
128	DOCSIS “full security” server IP address
128	TFTP Server IP address (for IP Phone software load)
129	PXE – undefined (vendor specific)	[RFC4578]
129	Kernel options. Variable length string
129	Call Server IP address
130	PXE – undefined (vendor specific)	[RFC4578]
130	Ethernet interface. Variable length string.
130	Discrimination string (to identify vendor)
131	PXE – undefined (vendor specific)	[RFC4578]
131	Remote statistics server IP address
132	PXE – undefined (vendor specific)	[RFC4578]
132	IEEE 802.1Q VLAN ID
133	PXE – undefined (vendor specific)	[RFC4578]
133	IEEE 802.1D/p Layer 2 Priority
134	PXE – undefined (vendor specific)	[RFC4578]
134	Diffserv Code Point (DSCP) for VoIP signalling and media streams
135	PXE – undefined (vendor specific)	[RFC4578]
135	HTTP Proxy for phone-specific applications
136	OPTION_PANA_AGENT	[RFC5192]
137	OPTION_V4_LOST	[RFC5223]
138	OPTION_CAPWAP_AC_V4	N	CAPWAP Access Controller addresses	[RFC5417]
139	OPTION-IPv4_Address-MoS	N	a series of suboptions	[RFC5678]
140	OPTION-IPv4_FQDN-MoS	N	a series of suboptions	[RFC5678]
141	SIP UA Configuration Service Domains	N	List of domain names to search for SIP User Agent Configuration	[RFC6011]
142	OPTION-IPv4_Address-ANDSF	N	ANDSF IPv4 Address Option for DHCPv4	[RFC6153]
143	OPTION_V4_SZTP_REDIRECT	N	This option provides a list of URIs for SZTP bootstrap servers	[RFC-ietf-netconf-zerotouch-29]
144	GeoLoc	16	Geospatial Location with Uncertainty	[RFC6225]
145	FORCERENEW_NONCE_CAPABLE	1	Forcerenew Nonce Capable	[RFC6704]
146	RDNSS Selection	N	Information for selecting RDNSS	[RFC6731]
147-149	Unassigned	[RFC3942]
150	TFTP server address	[RFC5859]
150	Etherboot
150	GRUB configuration path name
151	status-code	N+1	Status code and optional N byte text message describing status.	[RFC6926]
152	base-time	4	Absolute time (seconds since Jan 1, 1970) message was sent.	[RFC6926]
153	start-time-of-state	4	Number of seconds in the past when client entered current state.	[RFC6926]
154	query-start-time	4	Absolute time (seconds since Jan 1, 1970) for beginning of query.	[RFC6926]
155	query-end-time	4	Absolute time (seconds since Jan 1, 1970) for end of query.	[RFC6926]
156	dhcp-state	1	State of IP address.	[RFC6926]
157	data-source	1	Indicates information came from local or remote server.	[RFC6926]
158	OPTION_V4_PCP_SERVER	Variable; the minimum length is 5.	Includes one or multiple lists of PCP server IP addresses; each list is treated as a separate PCP server.	[RFC7291]
159	OPTION_V4_PORTPARAMS	4	This option is used to configure a set of ports bound to a shared IPv4 address.	[RFC7618]
160	DHCP Captive-Portal	N	DHCP Captive-Portal	[RFC7710]
161	OPTION_MUD_URL_V4	N (variable)	Manufacturer Usage Descriptions	[RFC8520]
162-174	Unassigned	[RFC3942]
175	Etherboot (Tentatively Assigned – 2005-06-23)
176	IP Telephone (Tentatively Assigned – 2005-06-23)
177	Etherboot (Tentatively Assigned – 2005-06-23)
177	PacketCable and CableHome (replaced by 122)
178-207	Unassigned	[RFC3942]
208	PXELINUX Magic	4	magic string = F1:00:74:7E	[RFC5071][Deprecated]
209	Configuration File	N	Configuration file	[RFC5071]
210	Path Prefix	N	Path Prefix Option	[RFC5071]
211	Reboot Time	4	Reboot Time	[RFC5071]
212	OPTION_6RD	18 + N	OPTION_6RD with N/4 6rd BR addresses	[RFC5969]
213	OPTION_V4_ACCESS_DOMAIN	N	Access Network Domain Name	[RFC5986]
214-219	Unassigned
220	Subnet Allocation Option	N	Subnet Allocation Option	[RFC6656]
221	Virtual Subnet Selection (VSS) Option	[RFC6607]
222-223	Unassigned	[RFC3942]
224-254	Reserved (Private Use)
255	End	0	None	[RFC2132]

DHCP Message Type 53 Values

Registration Procedure(s)

IETF Review

Reference[RFC2939]Available Formats

CSV

Value	Message Type	Reference
1	DHCPDISCOVER	[RFC2132]
2	DHCPOFFER	[RFC2132]
3	DHCPREQUEST	[RFC2132]
4	DHCPDECLINE	[RFC2132]
5	DHCPACK	[RFC2132]
6	DHCPNAK	[RFC2132]
7	DHCPRELEASE	[RFC2132]
8	DHCPINFORM	[RFC2132]
9	DHCPFORCERENEW	[RFC3203]
10	DHCPLEASEQUERY	[RFC4388]
11	DHCPLEASEUNASSIGNED	[RFC4388]
12	DHCPLEASEUNKNOWN	[RFC4388]
13	DHCPLEASEACTIVE	[RFC4388]
14	DHCPBULKLEASEQUERY	[RFC6926]
15	DHCPLEASEQUERYDONE	[RFC6926]
16	DHCPACTIVELEASEQUERY	[RFC7724]
17	DHCPLEASEQUERYSTATUS	[RFC7724]
18	DHCPTLS	[RFC7724]

NetWare/IP Option Type 63 Sub-Option Codes

Registration Procedure(s)

Not defined

Reference[RFC2242]Available Formats

CSV

Value	Message Type	Reference
1	NWIP_DOES_NOT_EXIST	[RFC2242]
2	NWIP_EXIST_IN_OPTIONS_AREA	[RFC2242]
3	NWIP_EXIST_IN_SNAME_FILE	[RFC2242]
4	NWIP_EXIST_BUT_TOO_BIG	[RFC2242]
5	NSQ_BROADCAST	[RFC2242]
6	PREFERRED_DSS	[RFC2242]
7	NEAREST_NWIP_SERVER	[RFC2242]
8	AUTORETRIES	[RFC2242]
9	AUTORETRY_SECS	[RFC2242]
10	NWIP_1_1	[RFC2242]
11	PRIMARY_DSS	[RFC2242]
12-255	Unassigned

DHCP Cablelabs Client Configuration Option Type 122 Sub-Option Codes

Registration Procedure(s)

IETF Review

Reference[RFC3495]Available Formats

CSV

Code	Sub-Option Description	Reference
1	TSP’s Primary DHCP Server Address	[RFC3495]
2	TSP’s Secondary DHCP Server Address	[RFC3495]
3	TSP’s Provisioning Server Address	[RFC3495]
4	TSP’s AS-REQ/AS-REP Backoff and Retry	[RFC3495]
5	TSP’s AP-REQ/AP-REP Backoff and Retry	[RFC3495]
6	TSP’s Kerberos Realm Name	[RFC3495]
7	TSP’s Ticket Granting Server Utilization	[RFC3495]
8	TSP’s Provisioning Timer Value	[RFC3495]
9	TSP’s Security Ticket Control	[RFC3594]
10	KDC Server Address	[RFC3634]
11-255	Unassigned

DHCP Status Code Type 151 Values

Registration Procedure(s)

IETF Review

Reference[RFC6926]Available Formats

CSV

Status-Code	Name	Reference
0	Success	[RFC6926]
1	UnspecFail	[RFC6926]
2	QueryTerminated	[RFC6926]
3	MalformedQuery	[RFC6926]
4	NotAllowed	[RFC6926]
5	DataMissing	[RFC7724]
6	ConnectionActive	[RFC7724]
7	CatchUpComplete	[RFC7724]
8	TLSConnectionRefused	[RFC7724]
9-255	Unassigned

DHCP State Type 156 Values

Registration Procedure(s)

IETF Review

Reference[RFC6926]Available Formats

CSV

State	Name	Reference
0	Reserved	[RFC6926]
1	AVAILABLE	[RFC6926]
2	ACTIVE	[RFC6926]
3	EXPIRED	[RFC6926]
4	RELEASED	[RFC6926]
5	ABANDONED	[RFC6926]
6	RESET	[RFC6926]
7	REMOTE	[RFC6926]
8	TRANSITIONING	[RFC6926]
9-255	Unassigned

Altitude Type Registry

Registration Procedure(s)

Standards Action

Reference[RFC6225]Available Formats

CSV

Type	Altitude Field Description	Reference
0	No known altitude	[RFC6225]
1	Altitude in meters	[RFC6225]
2	Altitude in floors	[RFC6225]
3-15	Unassigned

Datum Registry

Registration Procedure(s)

Standards Action

Reference[RFC6225]Available Formats

CSV

Datum	Datum Field Description	Reference
0	Reserved	[RFC6225]
1	Vertical datum WGS 84 defined by EPSG CRS Code 4327	[RFC6225]
2	Vertical datum NAD83 defined by EPSG CRS Code 4269 with North American Vertical Datum of 1988 (NAVD88)	[RFC6225]
3	Vertical datum NAD83 defined by EPSG CRS Code 4269 with Mean Lower Low Water (MLLW) as associated vertical datum	[RFC6225]
4-7	Unassigned

GeoLoc Option Version Registry

Registration Procedure(s)

Standards Action

Reference[RFC6225]Available Formats

CSV

Version	Description	Reference
0	Reserved	[RFC6225]
1	Implementations utilizing uncertainty parameters for both DHCPv4 and DHCPv6 GeoLoc options	[RFC6225]
2-3	Unassigned

CableLabs Client Configuration Option Ticket Control Mask Bit Definitions

Registration Procedure(s)

IETF Review

Reference[RFC3594]Available Formats

CSV

Bit	Description	Reference
0	the PacketCable Provisioning Server used by the CCD.	[RFC3594]
1	the group of all PacketCable Call Management Servers used by the CCD.	[RFC3594]
2-15	Reserved and MUST be set to 0.

DHCP Relay Agent Sub-Option Codes

Registration Procedure(s)

IETF Review

Reference[RFC3046]Available Formats

CSV

Code	Sub-Option Description	Reference
1	Agent Circuit ID Sub-option	[RFC3046]
2	Agent Remote ID Sub-option	[RFC3046]
3	Sub-option 3 is reserved and should not be assigned at this time; proprietary and incompatible usages of this sub-option value have been seen limited deployment.	[Ralph_Droms]
4	DOCSIS Device Class Suboption	[RFC3256]
5	Link selection Sub-option	[RFC3527]
6	Subscriber-ID Suboption	[RFC3993]
7	RADIUS Attributes Sub-option	[RFC4014]
8	Authentication Suboption	[RFC4030]
9	Vendor-Specific Information Suboption	[RFC4243]
10	Relay Agent Flags	[RFC5010]
11	Server Identifier Override Suboption	[RFC5107]
12	Relay Agent Identifier Sub-option	[RFC6925]
13	Access-Technology-Type Sub-option	[RFC7839]
14	Access-Network-Name Sub-option	[RFC7839]
15	Access-Point-Name Sub-option	[RFC7839]
16	Access-Point-BSSID Sub-option	[RFC7839]
17	Operator-Identifier Sub-option	[RFC7839]
18	Operator-Realm Sub-option	[RFC7839]
19	DHCPv4 Relay Source Port Sub-Option	[RFC8357]
20-150	Unassigned
151	DHCPv4 Virtual Subnet Selection Sub-Option	[RFC6607]
152	DHCPv4 Virtual Subnet Selection Control Sub-Option	[RFC6607]

Authentication Suboption (value 8) – Protocol identifier values

Registration Procedure(s)

IETF Review

Reference[RFC3118]Available Formats

CSV

Value	Protocol	Reference
0	DHCPv4 Configuration Token	[RFC3118, Section 4]
1	DHCPv4 Delayed Authentication	[RFC3118, Section 5]
2	DHCPv6 Delayed Authentication (Obsolete)	[RFC8415]
3	DHCPv6 Reconfigure Key Authentication	[RFC8415]
4-254	Unassigned
255	Reserved	[RFC3118]

Authentication Suboption (value 8) – Algorithm identifier values

Registration Procedure(s)

IETF Review

Reference[RFC4030]Available Formats

CSV

Value	Algorithm	Reference
0	Reserved	[RFC4030]
1	HMAC-SHA1 keyed hash	[RFC4030]

Authentication Suboption (value 8) – Replay Detection Method (RDM) identifier values

Registration Procedure(s)

IETF Review

Reference[RFC4030]Available Formats

CSV

Value	Description	Reference
0	Reserved	[RFC4030]
1	use of a monotonically increasing counter value	[RFC4030]

IEEE 802.21 Service Type (MoS DHCPv4 Address and FQDN Sub-Options)

Registration Procedure(s)

Standards Action

Reference[RFC5678]Available Formats

CSV

Value	Name	Reference
0	Reserved	[RFC5678]
1	IS	[RFC5678]
2	CS	[RFC5678]
3	ES	[RFC5678]
4-254	Unassigned
255	Reserved	[RFC5678]

NTP Time Source Suboptions

Registration Procedure(s)

IETF Review

Reference[RFC5908]Note

See the NTP Time Source Suboptions registry at [http://www.iana.org/assignments/dhcpv6-parameters]

VSS Type Options

Registration Procedure(s)

IETF Review

Reference[RFC6607]Available Formats

CSV

Type	Name	Reference
0	Network Virtual Terminal (NVT) ASCII VPN identifier	[RFC6607]
1	RFC2685 VPN-ID	[RFC2685][RFC6607]
2-253	Unassigned
254	All VPNs (wildcard)	[RFC6926]
255	Global, default VPN	[RFC6607]

People

ID	Name	Contact URI	Last Updated
[Ralph_Droms]	Ralph Droms	mailto:rdroms&cisco.com	2001-01