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 | [RFC8572] |
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] |