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Code Data length Description References 0 0 Pad. RFC 2132 1 4 Subnet Mask. RFC 2132 2 4 Time Offset (deprecated). RFC 2132 3 4+ Router. RFC 2132 4 4+ Time Server. RFC 2132 5 4+ Name Server. RFC 2132 6 4+ Domain Name Server. RFC 2132 7 4+ Log Server. RFC 2132 8 4+ Quote Server. RFC 2132 9 4+ LPR Server. RFC 2132 10 4+ Impress Server. RFC 2132 11 4+ Resource Location Server. RFC 2132 12 1+ Host Name. RFC 2132 13 2 Boot File Size. RFC 2132 14 1+ Merit Dump File. RFC 2132 15 1+ Domain Name. RFC 2132 16 4 Swap Server. RFC 2132 17 1+ Root Path. RFC 2132 18 1+ Extensions Path. RFC 2132 19 1 IP Forwarding enable/disable. RFC 2132 20 1 Non-local Source Routing enable/disable. RFC 2132 21 8+ Policy Filter. RFC 2132 22 2 Maximum Datagram Reassembly Size. RFC 2132 23 1 Default IP Time-to-live. RFC 2132 24 4 Path MTU Aging Timeout. RFC 2132 25 2+ Path MTU Plateau Table. RFC 2132 26 2 Interface MTU. RFC 2132 27 1 All Subnets are Local. RFC 2132 28 4 Broadcast Address. RFC 2132 29 1 Perform Mask Discovery. RFC 2132 30 1 Mask supplier. RFC 2132 31 1 Perform router discovery. RFC 2132 32 4 Router solicitation address. RFC 2132 33 8+ Static routing table. RFC 2132 34 1 Trailer encapsulation. RFC 2132 35 4 ARP cache timeout. RFC 2132 36 1 Ethernet encapsulation. RFC 2132 37 1 Default TCP TTL. RFC 2132 38 4 TCP keepalive interval. RFC 2132 39 1 TCP keepalive garbage. RFC 2132 40 1+ Network Information Service Domain. RFC 2132 41 4+ Network Information Servers. RFC 2132 42 4+ NTP servers. RFC 2132 43 1+ Vendor specific information. RFC 1533, RFC 2132 44 4+ NetBIOS over TCP/IP name server. RFC 1533, RFC 2132 45 4+ NetBIOS over TCP/IP Datagram Distribution Server. RFC 1533, RFC 2132 46 1 NetBIOS over TCP/IP Node Type. RFC 1533, RFC 2132 47 1+ NetBIOS over TCP/IP Scope. RFC 1533, RFC 2132 48 4+ X Window System Font Server. RFC 1533, RFC 2132 49 4+ X Window System Display Manager. RFC 1533, RFC 2132 50 4 Requested IP Address. RFC 1533, RFC 2132 51 4 IP address lease time. RFC 1533, RFC 2132 52 1 Option overload. RFC 1533, RFC 2132 53 1 DHCP message type. RFC 1533, RFC 2132, RFC 3203, RFC 4388 54 4 Server identifier. RFC 1533, RFC 2132 55 1+ Parameter request list. RFC 1533, RFC 2132 56 1+ Message. RFC 1533, RFC 2132 57 2 Maximum DHCP message size. RFC 1533, RFC 2132 58 4 Renew time value. RFC 1533, RFC 2132 59 4 Rebinding time value. RFC 1533, RFC 2132 60 1+ Class-identifier. RFC 1533, RFC 2132 61 2+ Client-identifier. RFC 1533, RFC 2132, RFC 4361 62 1 to 255 NetWare/IP Domain Name. RFC 2242 63 NetWare/IP information. RFC 2242 64 1+ Network Information Service+ Domain. RFC 2132 65 4+ Network Information Service+ Servers. RFC 2132 66 1+ TFTP server name. RFC 2132 67 1+ Bootfile name. RFC 2132 68 0+ Mobile IP Home Agent. RFC 2132 69 4+ Simple Mail Transport Protocol Server. RFC 2132 70 4+ Post Office Protocol Server. RFC 2132 71 4+ Network News Transport Protocol Server. RFC 2132 72 4+ Default World Wide Web Server. RFC 2132 73 4+ Default Finger Server. RFC 2132 74 4+ Default Internet Relay Chat Server. RFC 2132 75 4+ StreetTalk Server. RFC 2132 76 4+ StreetTalk Directory Assistance Server. RFC 2132 77 Variable. User Class Information. RFC 3004 78 Variable. SLP Directory Agent. RFC 2610 79 Variable. SLP Service Scope. RFC 2610 80 0 Rapid Commit. RFC 4039 81 4+. FQDN, Fully Qualified Domain Name. RFC 4702 82 Variable. Relay Agent Information. RFC 3046, RFC 5010 83 14+ Internet Storage Name Service. RFC 4174 84 RFC 3679 85 Variable. NDS servers. RFC 2241 86 Variable. NDS tree name. RFC 2241 87 Variable. NDS context. RFC 2241 88 Variable. BCMCS Controller Domain Name list. RFC 4280 89 4+ BCMCS Controller IPv4 address list. RFC 4280 90 Variable. Authentication. RFC 3118 91 4 client-last-transaction-time. RFC 4388 92 4n associated-ip. RFC 4388 93 Variable. Client System Architecture Type. RFC 4578 94 Variable. Client Network Interface Identifier. RFC 4578 95 Variable. LDAP, Lightweight Directory Access Protocol. RFC 3679 96 RFC 3679 97 Variable. Client Machine Identifier. RFC 4578 98 Open Group's User Authentication. RFC 2485 99 GEOCONF_CIVIC. RFC 4776 100 IEEE 1003.1 TZ String. RFC 4833 101 Reference to the TZ Database. RFC 4833 102 - 111 RFC 3679 112 Variable. NetInfo Parent Server Address. RFC 3679 113 Variable. NetInfo Parent Server Tag. RFC 3679 114 Variable. URL. RFC 3679 115 RFC 3679 116 1 Auto-Configure RFC 2563 117 2+ Name Service Search. RFC 2937 118 4 Subnet Selection. RFC 3011 119 Variable DNS domain search list. RFC 3397 120 Variable SIP Servers DHCP Option. RFC 3361 121 5+ Classless Static Route Option. RFC 3442 122 Variable CCC, CableLabs Client Configuration. RFC 3495, RFC 3594, RFC 3634 123 16 GeoConf. RFC 3825 124 Vendor-Identifying Vendor Class. RFC 3925 125 Vendor-Identifying Vendor-Specific. RFC 3925 126 RFC 3679 127 RFC 3679 128 TFTP Server IP address. RFC 4578 129 Call Server IP address. RFC 4578 130 Discrimination string. RFC 4578 131 Remote statistics server IP address. RFC 4578 132 802.1P VLAN ID. RFC 4578 133 802.1Q L2 Priority. RFC 4578 134 Diffserv Code Point. RFC 4578 135 HTTP Proxy for phone-specific applications. RFC 4578 136 4+ PANA Authentication Agent. RFC 5192 137 variable LoST Server. RFC 5223 138 CAPWAP Access Controller addresses. RFC 5417 139 OPTION-IPv4_Address-MoS. RFC 5678 140 OPTION-IPv4_FQDN-MoS. RFC 5678 141 2+ SIP UA Configuration Service Domains. RFC 6011 142 OPTION-IPv4_Address-ANDSF. RFC 6153 143 OPTION-IPv6_Address-ANDSF. RFC 6153 144 - 149 RFC 3942 150 TFTP server address. RFC 5859 150 Etherboot. GRUB configuration path name. 151 status-code. 152 base-time. 153 start-time-of-state. 154 query-start-time. 155 query-end-time. 156 dhcp-state. 157 data-source. 158 - 174 RFC 3942 175 Etherboot. 176 IP Telephone. 177 Etherboot. PacketCable and CableHome. 178 - 207 RFC 3942 208 pxelinux.magic (string) = F1:00:74:7E (241.0.116.126). RFC 5071 209 pxelinux.configfile (text). RFC 5071 210 pxelinux.pathprefix (text). RFC 5071 211 pxelinux.reboottime (unsigned integer 32 bits). RFC 5071 212 18+ OPTION_6RD. RFC 5969 213 OPTION_V4_ACCESS_DOMAIN. RFC 5986 214 - 219 220 Subnet Allocation. 221 1+ Virtual Subnet Selection. RFC 6607 222 223 RFC 3942 224 - 254 Private use. 255 0 End. RFC 2132