/etc/protocols

Linux

# Internet (IP) protocols
#
# Updated from iana.org/assignments/protocol-numbers and other
# sources.
# New protocols will be added on request if they have been officially
# assigned by IANA and are not historical.
# If you need a huge list of used numbers please install the nmap package.

ip    0    IP        # internet protocol, pseudo protocol number
hopopt    0    HOPOPT        # IPv6 Hop-by-Hop Option [RFC1883]
icmp    1    ICMP        # internet control message protocol
igmp    2    IGMP        # Internet Group Management
ggp    3    GGP        # gateway-gateway protocol
ipencap    4    IP-ENCAP    # IP encapsulated in IP (officially IP'')
st    5    ST        # ST datagram mode
tcp    6    TCP        # transmission control protocol
egp    8    EGP        # exterior gateway protocol
igp    9    IGP        # any private interior gateway (Cisco)
pup    12    PUP        # PARC universal packet protocol
udp    17    UDP        # user datagram protocol
hmp    20    HMP        # host monitoring protocol
xns-idp    22    XNS-IDP        # Xerox NS IDP
rdp    27    RDP        # "reliable datagram" protocol
iso-tp4    29    ISO-TP4        # ISO Transport Protocol class 4 [RFC905]
dccp    33    DCCP        # Datagram Congestion Control Prot. [RFC4340]
xtp    36    XTP        # Xpress Transfer Protocol
ddp    37    DDP        # Datagram Delivery Protocol
idpr-cmtp 38    IDPR-CMTP    # IDPR Control Message Transport
ipv6    41    IPv6        # Internet Protocol, version 6
ipv6-route 43    IPv6-Route    # Routing Header for IPv6
ipv6-frag 44    IPv6-Frag    # Fragment Header for IPv6
idrp    45    IDRP        # Inter-Domain Routing Protocol
rsvp    46    RSVP        # Reservation Protocol
gre    47    GRE        # General Routing Encapsulation
esp    50    IPSEC-ESP    # Encap Security Payload [RFC2406]
ah    51    IPSEC-AH    # Authentication Header [RFC2402]
skip    57    SKIP        # SKIP
ipv6-icmp 58    IPv6-ICMP    # ICMP for IPv6
ipv6-nonxt 59    IPv6-NoNxt    # No Next Header for IPv6
ipv6-opts 60    IPv6-Opts    # Destination Options for IPv6
rspf    73    RSPF CPHB    # Radio Shortest Path First (officially CPHB)
vmtp    81    VMTP        # Versatile Message Transport
eigrp    88    EIGRP        # Enhanced Interior Routing Protocol (Cisco)
ospf    89    OSPFIGP        # Open Shortest Path First IGP
ax.25    93    AX.25        # AX.25 frames
ipip    94    IPIP        # IP-within-IP Encapsulation Protocol
etherip    97    ETHERIP        # Ethernet-within-IP Encapsulation [RFC3378]
encap    98    ENCAP        # Yet Another IP encapsulation [RFC1241]
#    99            # any private encryption scheme
pim    103    PIM        # Protocol Independent Multicast
ipcomp    108    IPCOMP        # IP Payload Compression Protocol
vrrp    112    VRRP        # Virtual Router Redundancy Protocol [RFC5798]
l2tp    115    L2TP        # Layer Two Tunneling Protocol [RFC2661]
isis    124    ISIS        # IS-IS over IPv4
sctp    132    SCTP        # Stream Control Transmission Protocol
fc    133    FC        # Fibre Channel
mobility-header 135 Mobility-Header # Mobility Support for IPv6 [RFC3775]
udplite    136    UDPLite        # UDP-Lite [RFC3828]
mpls-in-ip 137    MPLS-in-IP    # MPLS-in-IP [RFC4023]
manet    138            # MANET Protocols [RFC5498]
hip    139    HIP        # Host Identity Protocol
shim6    140    Shim6        # Shim6 Protocol [RFC5533]
wesp    141    WESP        # Wrapped Encapsulating Security Payload
rohc    142    ROHC        # Robust Header Compression