lft ☆
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Description:
Layer Four Traceroute (LFT), an advanced traceroute tool
Type: Formula  |  Tracked Since: Dec 28, 2025
Links: Homepage  |  formulae.brew.sh
Category: Networking
Tags: networking traceroute diagnostics tcp layer4
Install: brew install lft
About:
LFT (Layer Four Traceroute) is an advanced network diagnostic tool that goes beyond standard ICMP traceroutes by operating at the transport layer. It can map the network path of TCP and UDP connections, making it effective for tracing routes through firewalls and NAT devices. The tool provides detailed visibility into network topology and performance bottlenecks.
Key Features:
  • Layer 4 traceroute capabilities using TCP/UDP
  • Firewall and NAT traversal
  • AS number and ISP identification
  • Visual network path mapping
  • Support for multiple probe types
Use Cases:
  • Diagnosing network routing issues through firewalls
  • Mapping network topology and ISP paths
  • Identifying network bottlenecks and latency sources
  • Security reconnaissance and network discovery
Alternatives:
  • traceroute – Standard ICMP-based traceroute, less effective through firewalls
  • mtr – Combines traceroute and ping, real-time network diagnostics
  • tcptraceroute – TCP-based traceroute, similar Layer 4 capabilities
Version History
Detected Version Rev Change Commit
Sep 17, 2025 8:31pm 0 VERSION_BUMP a8d19b9b
Sep 17, 2025 7:03pm 0 VERSION_BUMP 2654149b
Sep 14, 2024 1:56pm 0 VERSION_BUMP 64ee7154
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