1 OS Version Protocol TTL Notes
5 AIX 3.2, 4.1 ICMP 255 3
7 BSDI BSD/OS 3.1 4.0 ICMP 255 3
9 Compa Tru64 v5.0 ICMP 64 3
11 DEC Pathworks V5 TCP and UDP 30 2
13 FreeBSD 2.1R TCP and UDP 64 2
14 FreeBSD 3.4, 4.0 ICMP 255 3
17 HP-UX 9.0x TCP and UDP 30 2
18 HP-UX 10.01 TCP and UDP 64 2
19 HP-UX 10.20 ICMP 255 3
20 HP-UX 11.00 ICMP 255 3
23 Irix 5.3 TCP and UDP 60 2
24 Irix 6.x TCP and UDP 60 2
25 Irix 6.5.3, 6.5.8 ICMP 255 2
29 Linux 2.0.x kernel ICMP 64 3
30 Linux 2.2.14 kernel ICMP 255 3
31 Linux 2.4 kernel ICMP 255 3
32 Linux Red Hat 9 ICMP and TCP 64
34 MacOS/MacTCP 2.0.x TCP and UDP 60 2
38 OpenBSD 2.6 & 2.7 ICMP 255 3
40 OpenVMS 7.1-2 ICMP 255 3
47 Solaris 2.5.1, 2.6, 2.7, 2.8 ICMP 255 3
50 Stratus TCP_OS ICMP 255
51 Stratus TCP_OS (14.2-) TCP and UDP 30 1
52 Stratus TCP_OS (14.3+) TCP and UDP 64 1
53 Stratus STCP ICMP/TCP/UDP 60
55 SunOS 4.1.3/4.1.4 TCP and UDP 60 2
56 SunOS 5.7 ICMP and TCP 255
58 Ultrix V4.1/V4.2A TCP 60 2
59 Ultrix V4.1/V4.2A UDP 30 2
60 Ultrix V4.2 - 4.5 ICMP 255 3
62 VMS/Multinet TCP and UDP 64 2
65 VMS/Wollongong 1.1.1.1 TCP 128 2
66 VMS/Wollongong 1.1.1.1 UDP 30 2
67 VMS/UCX TCP and UDP 128 2
69 Windows for Workgroups TCP and UDP 32 2
70 Windows 95 TCP and UDP 32 2
72 Windows 98, 98 SE ICMP 128 3
74 Windows NT 3.51 TCP and UDP 32 2
75 Windows NT 4.0 TCP and UDP 128 2
76 Windows NT 4.0 SP5- 32 4
77 Windows NT 4.0 SP6+ 128 4
78 Windows NT 4 WRKS SP 3, SP 6a ICMP 128 3
79 Windows NT 4 Server SP4 ICMP 128 3
81 Windows 2000 pro ICMP/TCP/UDP 128
82 Windows 2000 family ICMP 128 3
83 Windows Server 2003 128 4
84 Windows XP ICMP/TCP/UDP 128