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Article ID: 289892 - Last Review: November 19, 2008 - Revision: 3.0

This article was previously published under Q289892

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Windows 2000 and Windows Server 2003 have the ability to define Internet protocol (IP) packet filters for protocol numbers. IP packet filters are commonly used to restrict traffic in and out of each interface.


Protocol numbers are used to configure firewalls, routers, and proxy servers. In Internet Protocol version 4 (IPv4, Request for Comments [RFC] 791I), the protocol number can be found in the Protocol field of an IP header.

The following section contains a list of currently assigned IP protocol numbers. For more information about this topic (including references), please visit the following Internet Assigned Numbers Authority (IANA) Web site:
IANA Web Site (
NOTE: The information in this article is subject to change, and is meant only as a reference for you to use when you perform administrative tasks such as IP protocol filtering in Windows 2000 and Windows Server 2003.


NOTE: The protocols numbers are shown in decimal notation.
Decimal    Keyword     Protocol
=======    =======     ==============
     0     HOPOPT      IPv6 Hop-by-Hop Option            
     1     ICMP        Internet Control Message           
     2     IGMP        Internet Group Management         
     3     GGP         Gateway-to-Gateway                 
     4     IP          IP in IP (encapsulation)          
     5     ST          Stream                     
     6     TCP         Transmission Control               
     7     CBT         CBT                             
     8     EGP         Exterior Gateway Protocol     
     9     IGP         any private interior gateway         
                       (used by Cisco for their IGRP)
    10     BBN-RCC-MON BBN RCC Monitoring                    
    11     NVP-II      Network Voice Protocol         
    12     PUP         PUP                             
    13     ARGUS       ARGUS                                
    14     EMCON       EMCON                                 
    15     XNET        Cross Net Debugger            
    16     CHAOS       Chaos                                 
    17     UDP         User Datagram                  
    18     MUX         Multiplexing                    
    19     DCN-MEAS    DCN Measurement Subsystems           
    20     HMP         Host Monitoring                
    21     PRM         Packet Radio Measurement              
    22     XNS-IDP     XEROX NS IDP               
    23     TRUNK-1     Trunk-1                              
    24     TRUNK-2     Trunk-2                              
    25     LEAF-1      Leaf-1                               
    26     LEAF-2      Leaf-2                               
    27     RDP         Reliable Data Protocol         
    28     IRTP        Internet Reliable Transaction  
    29     ISO-TP4     ISO Transport Protocol Class 4 
    30     NETBLT      Bulk Data Transfer Protocol    
    31     MFE-NSP     MFE Network Services Protocol  
    32     MERIT-INP   MERIT Internodal Protocol             
    33     SEP         Sequential Exchange Protocol        
    34     3PC         Third Party Connect Protocol         
    35     IDPR        Inter-Domain Policy Routing Protocol 
    36     XTP         XTP                                   
    37     DDP         Datagram Delivery Protocol            
    38     IDPR-CMTP   IDPR Control Message Transport Proto 
    39     TP++        TP++ Transport Protocol               
    40     IL          IL Transport Protocol            
    41     ISATAP      ISATAP                              
    42     SDRP        Source Demand Routing Protocol       
    43     IPv6-Route  Routing Header for IPv6           
    44     IPv6-Frag   Fragment Header for IPv6          
    45     IDRP        Inter-Domain Routing Protocol   
    46     RSVP        Reservation Protocol           
    47     GRE         General Routing Encapsulation     
    48     MHRP        Mobile Host Routing Protocol
    49     BNA         BNA                          
    50     ESP         Encap Security Payload for IPv6   
    51     AH          Authentication Header for IPv6    
    52     I-NLSP      Integrated Net Layer Security  TUBA 
    53     SWIPE       IP with Encryption                    
    54     NARP        NBMA Address Resolution Protocol  
    55     MOBILE      IP Mobility                       
    56     TLSP        Transport Layer Security Protocol   
                       using Kryptonet key management
    57     SKIP        SKIP                              
    58     IPv6-ICMP   ICMP for IPv6                     
    59     IPv6-NoNxt  No Next Header for IPv6           
    60     IPv6-Opts   Destination Options for IPv6      
    61                 any host internal protocol           
    62     CFTP        CFTP                            
    63                 any local network                    
    64     SAT-EXPAK   SATNET and Backroom EXPAK             
    65     KRYPTOLAN   Kryptolan                            
    66     RVD         MIT Remote Virtual Disk Protocol      
    67     IPPC        Internet Pluribus Packet Core         
    68                 any distributed file system          
    69     SAT-MON     SATNET Monitoring                     
    70     VISA        VISA Protocol                        
    71     IPCV        Internet Packet Core Utility          
    72     CPNX        Computer Protocol Network Executive  
    73     CPHB        Computer Protocol Heart Beat         
    74     WSN         Wang Span Network                     
    75     PVP         Packet Video Protocol                 
    76     BR-SAT-MON  Backroom SATNET Monitoring            
    77     SUN-ND      SUN ND PROTOCOL-Temporary             
    78     WB-MON      WIDEBAND Monitoring                   
    79     WB-EXPAK    WIDEBAND EXPAK                        
    80     ISO-IP      ISO Internet Protocol                 
    81     VMTP        VMTP                                 
    82     SECURE-VMTP SECURE-VMTP                          
    83     VINES       VINES                                 
    84     TTP         TTP                                   
    85     NSFNET-IGP  NSFNET-IGP                            
    86     DGP         Dissimilar Gateway Protocol     
    87     TCF         TCF                                  
    88     EIGRP       EIGRP                           
    89     OSPFIGP     OSPFIGP                      
    90     Sprite-RPC  Sprite RPC Protocol            
    91     LARP        Locus Address Resolution Protocol     
    92     MTP         Multicast Transport Protocol          
    93     AX.25       AX.25 Frames                         
    94     IPIP        IP-within-IP Encapsulation Protocol   
    95     MICP        Mobile Internetworking Control Pro.   
    96     SCC-SP      Semaphore Communications Sec. Pro.    
    97     ETHERIP     Ethernet-within-IP Encapsulation     
    98     ENCAP       Encapsulation Header         
    99                 any private encryption scheme        
   100     GMTP        GMTP                                 
   101     IFMP        Ipsilon Flow Management Protocol   
   102     PNNI        PNNI over IP                       
   103     PIM         Protocol Independent Multicast  
   104     ARIS        ARIS                              
   105     SCPS        SCPS               
   106     QNX         QNX              
   107     A/N         Active Networks                    
   108     IPComp      IP Payload Compression Protocol   
   109     SNP         Sitara Networks Protocol          
   110     Compaq-Peer Compaq Peer Protocol                
   111     IPX-in-IP   IPX in IP                
   112     VRRP        Virtual Router Redundancy Protocol 
   113     PGM         PGM Reliable Transport Protocol  
   114                 any 0-hop protocol                   
   115     L2TP        Layer Two Tunneling Protocol        
   116     DDX         D-II Data Exchange (DDX)           
   117     IATP        Interactive Agent Transfer Protocol  
   118     STP         Schedule Transfer Protocol            
   119     SRP         SpectraLink Radio Protocol       
   120     UTI         UTI            
   121     SMP         Simple Message Protocol            
   122     SM          SM                
   123     PTP         Performance Transparency Protocol   
   124     ISIS over IPv4               
   125     FIRE                      
   126     CRTP        Combat Radio Transport Protocol  
   127     CRUDP       Combat Radio User Datagram    
   128     SSCOPMCE                  
   129     IPLT                  
   130     SPS         Secure Packet Shield             
   131     PIPE        Private IP Encapsulation within IP       
   132     SCTP        Stream Control Transmission Protocol   
   133     FC          Fibre Channel                        
   134-254             Unassigned                           
   255                 Reserved                             


  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
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