ByteLens is described as 'Free online protocol visualizer and packet analysis tool for TCP, UDP, IPv4, IPv6, DNS, and Ethernet. It helps developers, students, and network engineers parse hex packets, inspect protocol fields, and understand packet structures interactively' and is a network analyzer in the network & admin category. There are 2 alternatives to ByteLens, not only websites but also apps for a variety of platforms, including BSD, Linux, Mac, Windows and Arch Linux apps. The best ByteLens alternative is Wireshark, which is both free and Open Source.
Wireshark is a premier network protocol analyzer used globally in industries and education, offering multi-platform support, deep protocol inspection, powerful display filters, and VoIP analysis. It allows both live capture and offline analysis, supporting various networks and protocols.
Impacket is a collection of Python classes for working with network protocols. Impacket is focused on providing low-level programmatic access to the packets and for some protocols (e.g. SMB1-3 and MSRPC) the protocol implementation itself.
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