TTL=64(*nix)
The hop count so if your getting 61 then there are 3 hops and its a *nix device. Most likely Linux.
TTL=128(Windows)
Again if the TTL is 127 then the hop is 1 and it is a Windows box.
TTL=254(Solaris/AIX)
Again if the TTL is 250 then the hop count is 4 and it is a Solaris box.
OS
|
Version
|
Protocol
|
TTL
|
AIX
|
|
TCP
|
60
|
AIX
|
|
UDP
|
30
|
AIX
|
3.2, 4.1
|
ICMP
|
255
|
|
|
|
|
BSDI
|
BSD/OS 3.1 and 4.0
|
ICMP
|
255
|
|
|
|
|
Compa
|
Tru64 v5.0
|
ICMP
|
64
|
|
|
|
|
DEC Pathworks
|
V5
|
TCP and UDP
|
30
|
|
|
|
|
FreeBSD
|
2.1R
|
TCP and UDP
|
64
|
FreeBSD
|
3.4, 4.0
|
ICMP
|
255
|
FreeBSD
|
5
|
ICMP
|
64
|
|
|
|
|
HP-UX
|
9.0x
|
TCP and UDP
|
30
|
HP-UX
|
10.01
|
TCP and UDP
|
64
|
HP-UX
|
10.2
|
ICMP
|
255
|
HP-UX
|
11
|
ICMP
|
255
|
HP-UX
|
11
|
TCP
|
64
|
|
|
|
|
Irix
|
5.3
|
TCP and UDP
|
60
|
Irix
|
6.x
|
TCP and UDP
|
60
|
Irix
|
6.5.3, 6.5.8
|
ICMP
|
255
|
|
|
|
|
MPE/IX (HP)
|
|
ICMP
|
200
|
|
|
|
|
Linux
|
2.0.x kernel
|
ICMP
|
64
|
Linux
|
2.2.14 kernel
|
ICMP
|
255
|
Linux
|
2.4 kernel
|
ICMP
|
255
|
Linux
|
Red Hat 9
|
ICMP and TCP
|
64
|
|
|
|
|
MacOS/MacTCP
|
2.0.x
|
TCP and UDP
|
60
|
MacOS/MacTCP
|
X (10.5.6)
|
ICMP/TCP/UDP
|
64
|
|
|
|
|
NetBSD
|
|
ICMP
|
255
|
|
|
|
|
Netgear FVG318
|
|
ICMP and UDP
|
64
|
|
|
|
|
OpenBSD
|
2.6 & 2.7
|
ICMP
|
255
|
|
|
|
|
OpenVMS
|
7.1-2
|
ICMP
|
255
|
|
|
|
|
OS/2
|
TCP/IP 3.0
|
|
64
|
|
|
|
|
OSF/1
|
V3.2A
|
TCP
|
60
|
OSF/1
|
V3.2A
|
UDP
|
30
|
|
|
|
|
Solaris
|
2.5.1, 2.6, 2.7, 2.8
|
ICMP
|
255
|
Solaris
|
2.8
|
TCP
|
64
|
|
|
|
|
Stratus
|
TCP_OS
|
ICMP
|
255
|
Stratus
|
TCP_OS (14.2-)
|
TCP and UDP
|
30
|
Stratus
|
TCP_OS (14.3+)
|
TCP and UDP
|
64
|
Stratus
|
STCP
|
ICMP/TCP/UDP
|
60
|
|
|
|
|
SunOS
|
4.1.3/4.1.4
|
TCP and UDP
|
60
|
SunOS
|
5.7
|
ICMP and TCP
|
255
|
|
|
|
|
Ultrix
|
V4.1/V4.2A
|
TCP
|
60
|
Ultrix
|
V4.1/V4.2A
|
UDP
|
30
|
Ultrix
|
V4.2 - 4.5
|
ICMP
|
255
|
|
|
|
|
VMS/Multinet
|
|
TCP and UDP
|
64
|
VMS/TCPware
|
|
TCP
|
60
|
VMS/TCPware
|
|
UDP
|
64
|
VMS/Wollongong
|
1.1.1.1
|
TCP
|
128
|
VMS/Wollongong
|
1.1.1.1
|
UDP
|
30
|
VMS/UCX
|
|
TCP and UDP
|
128
|
|
|
|
|
Windows
|
for Workgroups
|
TCP and UDP
|
32
|
Windows
|
95
|
TCP and UDP
|
32
|
Windows
|
98
|
ICMP
|
32
|
Windows
|
98, 98 SE
|
ICMP
|
128
|
Windows
|
98
|
TCP
|
128
|
Windows
|
NT 3.51
|
TCP and UDP
|
32
|
Windows
|
NT 4.0
|
TCP and UDP
|
128
|
Windows
|
NT 4.0 SP5-
|
|
32
|
Windows
|
NT 4.0 SP6+
|
|
128
|
Windows
|
NT 4 WRKS SP 3, SP 6a
|
ICMP
|
128
|
Windows
|
NT 4 Server SP4
|
ICMP
|
128
|
Windows
|
ME
|
ICMP
|
128
|
Windows
|
2000 pro
|
ICMP/TCP/UDP
|
128
|
Windows
|
2000 family
|
ICMP
|
128
|
Windows
|
Server 2003
|
|
128
|
Windows
|
XP
|
ICMP/TCP/UDP
|
128
|
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