| Code | Name | Type | Description | 
| 1 | Subnet | IP | Subnet mask, dotted Internet address | 
| 2 | UTCoffst | Number | Coordinated universal Number offset (seconds) | 
| 3 | Router | IP | List of routers | 
| 4 | Timeserv | IP | List of RFC-868 servers | 
 
| 5 | IEN116ns | IP | List of IEN-116 name servers | 
 
| 6 | DNSserv | IP | List of DNS name servers | 
| 7 | Logserv | IP | List of MIT-LCS UDP log servers | 
 
| 8 | Cookie | IP | List of RFC-865 cookie servers | 
 
| 9 | Lprserv | IP | List of RFC-1179 line printer servers | 
 
| 10 | Impress | IP | List of Imagen Impress servers | 
 
| 11 | Resource | IP | List of RFC-887 resource location servers | 
| 12 | Hostname | Boolean | Return client's host name, value from hosts database | 
| 13 | Bootsize | Number | Number of 512 octet blocks in boot image | 
 
| 14 | Dumpfile | ASCII | Path where core image should be dumped | 
| 15 | DNSdmain | ASCII | DNS domain name | 
| 16 | Swapserv | IP | Client's swap server | 
| 17 | Rootpath | ASCII | Client's root path | 
| 18 | ExtendP | ASCII | Extensions path | 
| 19 | IpFwdF | Number | IP forwarding enable/disable (1/0) | 
| 20 | NLrouteF | Number | Non-local source routing | 
| 21 | PFilter | IP | Policy filter | 
| 22 | MaxIpSiz | Number | Maximum datagram reassembly size | 
 
| 23 | IpTTL | Byte | Default IP time to live (1=< x <=225) | 
| 24 | PathTO | Number | RFC-1191 Path MTU aging timeout | 
 
| 25 | PathTbl | Number | RFC-1191 Path MTU plateau table | 
 
| 26 | MTU | Number | Interface MTU, (x <=68) | 
| 27 | SameMtuF | Number | All subnets are local | 
| 28 | Broadcst | IP | Broadcast address | 
 
| 29 | MaskDscF | Number | Perform mask discovery | 
| 30 | MaskSupF | Number | Mask supplier | 
| 31 | RDiscvyF | Number | Perform route discovery | 
 
| 32 | RSolictS | IP | Router solicitation address | 
 
| 33 | StaticRt | IP | Static routes, double IP (network router) | 
 
| 34 | TrailerF | Number | Trailer encapsulation | 
| 35 | ArpTimeO | Number | Arp cache timeout | 
| 36 | EthEncap | Number | Ethernet encapsulation | 
 
| 37 | TcpTTL | Number | TCP default time to live | 
 
| 38 | TcpKaInt | Number | TCP keep alive interval | 
| 39 | TcpKaGbF | Number | Keep alive garbage | 
 
| 40 | NISdmain | ASCII | NIS domain_ name | 
 
| 41 | NISservs | IP | List of NIS servers | 
 
| 42 | NTPservs | IP | List of NTP servers | 
 
| 44 | NetBNms | IP | List of Netbios name servers | 
 
| 45 | NetBDsts | IP | List of Netbios distribution servers | 
 
| 46 | NetBNdT | Number | Netbios node type (1=B-node, 2=P, 4=M, 8=H) | 
 
| 47 | NetBScop | ASCII | Netbios scope | 
 
| 48 | XFontSrv | IP | List of X Window font servers | 
| 49 | XDispMgr | IP | X Window display managers | 
 
| 51 | LeaseTim | Number | Lease time policy | 
 
| 56 | Message | ASCII | Message to be displayed on client | 
| 58 | T1Time | Number | Renewal (T1) time | 
 
| 59 | T2Time | Number | Rebinding (T2) time | 
| 62 | NW_dmain | ASCII | Netware/IP domain name | 
| 63 | NWIPOpts | Octet | Netware/IP options | 
| 64 | NIS+dom | ASCII | NIS+ domain name | 
 
| 65 | NIS+serv | IP | List of NIS+ servers | 
 
| 66 | TFTPsrvN | ASCII | Trivial File Transfer Protocol (TFTP) server hostname | 
 
| 67 | OptBootF | ASCII | Optional bootfile name | 
 
| 68 | MblIPAgt | IP | Mobile IP home agents | 
 
| 69 | SMTPserv | IP | Simple Mail Transport Protocol (SMTP) server | 
| 70 | POP3serv | IP | Post Office Protocol (POP3) server | 
| 71 | NNTPserv | IP | Network News Transport Protocol (NNTP) server | 
| 72 | WWWservs | IP | Default World Wide Web server | 
| 73 | Fingersv | IP | Default finger server | 
| 74 | IRCservs | IP | Internet Relay Chat (IRC) server | 
| 75 | STservs | IP | StreetTalk server | 
 
| 76 | STDAservs | IP | StreetTalk directory assistance server | 
| 77 | UserClas | ASCII | User class information | 
| 78 | SLP_DA | Octet | Directory agent | 
| 79 | SLP_SS | Octet | Service scope | 
| 82 | AgentOpt | Octet | Agent circuit ID | 
| 89 | FQDN | Octet | Fully Qualified Domain Name | 
| 93 | PXEarch | Number | Client system architecture | 
| 94 | PXEnii | Octet | Client Network Device Interface | 
| 97 | PXEcid | Octet | UUID/GUID-based client identifier | 
| N/A | BootFile | ASCII | File to boot | 
| N/A | BootSrvA | IP | Boot server | 
| N/A | BootSrvN | ASCII | Boot server host name | 
| NA | LeaseNeg | Boolean | Lease is negotiable flag (present=true) | 
| NA | Include | ASCII | Include listed macro values in this macro |