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LFT, short for Layer Four Traceroute, is a sort of 'traceroute' that often works much faster (than the commonly-used Van Jacobson method) and goes through many configurations of packet-filter based firewalls. More importantly, LFT implements numerous other features including AS number lookups, loose source routing, netblock name lookups, et al. Though LFT has been around since 1998, its development effort has just recently resumed.

What's New

Version 3.36:
  • Added support for 4-byte ASNs


  • OS X 10.1 or later
  • libpcap

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Layer Four Traceroute User Discussion

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Negritude Member IconComment+1082

FYI, this is source code only, so you must compile manually. You can find the older 3.1 version via MacPorts.

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Version 3.3

Version 3.3 is now available via MacPorts.

Frodo_life Member IconComment+286

installed the software but where is it?? can not be found in Applications or anywhere else!

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Version 3.1

You can find it in Terminal.

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Current Version (3.x)


Downloads 6,588
Version Downloads 163
License Free
Date 14 Apr 2014
Platform OS X / PPC 32 / Intel 32
Price Free