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DHCP Scope Options


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