| OS Version | TCP TTL | UDP TTL |
| AIX | 60 | 30 |
| DEC Pathworks V5 | 30 | 30 |
| HP/UX 9.0x | 30 | 30 |
| HP/UX 10.01 | 64 | 64 |
| Irix | 60 | 60 |
| Ultrix V4.1/V4.2A | 60 | 30 |
| VMS/Multinet | 64 | 64 |
| VMS/TCPware | 60 | 64 |
| VMS/Wollongong | 128 | 30 |
| VMS/UCX (latest rel.) | 128 | 128 |
| OSF/1 V3.2A | 60 | 30 |
| MacOS/MacTCP 2.0.x | 60 | 60 |
| FreeBSD 2.1R | 64 | 64 |
| Linux | 64 | 64 |
| Solaris 2.x | 255 | 255 |
| SunOS 4.1.3/4.1.4 | 60 | 60 |
| OS/2 TCP/IP 3.0 | 64 | 64 |
| MS Windows 95 | 32 | 32 |
| MS Windows NT 3.51 | 32 | 32 |
| MS Windows NT4 / W2k / XP | 128 | 128 |