keyword	name	number
HOPOPT	IPv6 Hop-by-Hop Option	0
ICMP	Internet Control Message	1
IGMP	Internet Group Management	2
GGP	Gateway-to-Gateway	3
IPv4	IPv4 encapsulation	4
ST	Stream	5
TCP	Transmission Control	6
CBT	CBT	7
EGP	Exterior Gateway Protocol	8
IGP	any private interior gateway (used by Cisco for their IGRP)	9
BBN-RCC-MON	BBN RCC Monitoring	10
NVP-II	Network Voice Protocol	11
PUP	PUP	12
EMCON	EMCON	14
XNET	Cross Net Debugger	15
CHAOS	Chaos	16
UDP	User Datagram	17
MUX	Multiplexing	18
DCN-MEAS	DCN Measurement Subsystems	19
HMP	Host Monitoring	20
PRM	Packet Radio Measurement	21
XNS-IDP	XEROX NS IDP	22
TRUNK-1	Trunk-1	23
TRUNK-2	Trunk-2	24
LEAF-1	Leaf-1	25
LEAF-2	Leaf-2	26
RDP	Reliable Data Protocol	27
IRTP	Internet Reliable Transaction	28
ISO-TP4	ISO Transport Protocol Class 4	29
NETBLT	Bulk Data Transfer Protocol	30
MFE-NSP	MFE Network Services Protocol	31
MERIT-INP	MERIT Internodal Protocol	32
DCCP	Datagram Congestion Control Protocol	33
3PC	Third Party Connect Protocol	34
IDPR	Inter-Domain Policy Routing Protocol	35
XTP	XTP	36
DDP	Datagram Delivery Protocol	37
IDPR-CMTP	IDPR Control Message Transport Proto	38
TP++	TP++ Transport Protocol	39
IL	IL Transport Protocol	40
IPv6	IPv6 encapsulation	41
SDRP	Source Demand Routing Protocol	42
IPv6-Route	Routing Header for IPv6	43
IPv6-Frag	Fragment Header for IPv6	44
IDRP	Inter-Domain Routing Protocol	45
RSVP	Reservation Protocol	46
GRE	Generic Routing Encapsulation	47
DSR	Dynamic Source Routing Protocol	48
BNA	BNA	49
ESP	Encap Security Payload	50
AH	Authentication Header	51
I-NLSP	Integrated Net Layer Security TUBA	52
NARP	NBMA Address Resolution Protocol	54
Min-IPv4	Minimal IPv4 Encapsulation	55
TLSP	Transport Layer Security Protocol using Kryptonet key management	56
SKIP	SKIP	57
IPv6-ICMP	ICMP for IPv6	58
IPv6-NoNxt	No Next Header for IPv6	59
IPv6-Opts	Destination Options for IPv6	60
CFTP	CFTP	62
SAT-EXPAK	SATNET and Backroom EXPAK	64
KRYPTOLAN	Kryptolan	65
RVD	MIT Remote Virtual Disk Protocol	66
IPPC	Internet Pluribus Packet Core	67
SAT-MON	SATNET Monitoring	69
VISA	VISA Protocol	70
IPCV	Internet Packet Core Utility	71
CPNX	Computer Protocol Network Executive	72
CPHB	Computer Protocol Heart Beat	73
WSN	Wang Span Network	74
PVP	Packet Video Protocol	75
BR-SAT-MON	Backroom SATNET Monitoring	76
SUN-ND	SUN ND PROTOCOL-Temporary	77
WB-MON	WIDEBAND Monitoring	78
WB-EXPAK	WIDEBAND EXPAK	79
ISO-IP	ISO Internet Protocol	80
VMTP	VMTP	81
SECURE-VMTP	SECURE-VMTP	82
VINES	VINES	83
IPTM	Internet Protocol Traffic Manager	84
NSFNET-IGP	NSFNET-IGP	85
DGP	Dissimilar Gateway Protocol	86
TCF	TCF	87
EIGRP	EIGRP	88
OSPFIGP	OSPFIGP	89
Sprite-RPC	Sprite RPC Protocol	90
LARP	Locus Address Resolution Protocol	91
MTP	Multicast Transport Protocol	92
AX.25	AX.25 Frames	93
IPIP	IP-within-IP Encapsulation Protocol	94
SCC-SP	Semaphore Communications Sec. Pro.	96
ETHERIP	Ethernet-within-IP Encapsulation	97
ENCAP	Encapsulation Header	98
GMTP	GMTP	100
IFMP	Ipsilon Flow Management Protocol	101
PNNI	PNNI over IP	102
PIM	Protocol Independent Multicast	103
ARIS	ARIS	104
SCPS	SCPS	105
QNX	QNX	106
A/N	Active Networks	107
IPComp	IP Payload Compression Protocol	108
SNP	Sitara Networks Protocol	109
Compaq-Peer	Compaq Peer Protocol	110
IPX-in-IP	IPX in IP	111
VRRP	Virtual Router Redundancy Protocol	112
PGM	PGM Reliable Transport Protocol	113
L2TP	Layer Two Tunneling Protocol	115
DDX	D-II Data Exchange (DDX)	116
IATP	Interactive Agent Transfer Protocol	117
STP	Schedule Transfer Protocol	118
SRP	SpectraLink Radio Protocol	119
UTI	UTI	120
SMP	Simple Message Protocol	121
PTP	Performance Transparency Protocol	123
ISIS over IPv4	ISIS over IPv4	124
FIRE	FIRE	125
CRTP	Combat Radio Transport Protocol	126
CRUDP	Combat Radio User Datagram	127
SSCOPMCE	SSCOPMCE	128
IPLT	IPLT	129
SPS	Secure Packet Shield	130
PIPE	Private IP Encapsulation within IP	131
SCTP	Stream Control Transmission Protocol	132
FC	Fibre Channel	133
RSVP-E2E-IGNORE	RSVP-E2E-IGNORE	134
Mobility Header	Mobility Header	135
UDPLite	UDPLite	136
MPLS-in-IP	MPLS-in-IP	137
manet	MANET Protocols	138
HIP	Host Identity Protocol	139
Shim6	Shim6 Protocol	140
WESP	Wrapped Encapsulating Security Payload	141
ROHC	Robust Header Compression	142
Ethernet	Ethernet	143
AGGFRAG	AGGFRAG encapsulation payload for ESP	144
NSH	Network Service Header	145
Homa	Homa	146
BIT-EMU	Bit-stream Emulation	147