| 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 oder Ruckes Zonedirector AP Controller | 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 z.B. Ruckes CPE | 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 Pointd | 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 | |
| 234 | Variable | Sophos UTM AP Controller | |
| 255 | 0 | End | RFC 2132 |
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