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Here you can find a small collection of small tools and scripts I've written.
Registed domain. Python script that can extract the registered domain (or effective TLD, or public suffix) from DNS domain names. Uses Mozilla's Public Suffix List
A document describing how Rendezvous, Bonjour, Zerfconf, multicast DNS (mDNS), DNS service discovery (DNS-SD), etc. work.
A document describing how the "Microcosft Windows Protocol Suite" works and interacts. In particular, we look at NetBIOS, WINS, SMB, SMB2, CIFS, dynamic DNS updates. Or to put it another way: what goes on on ports 137/udp, 138/udp, 139/tcp, and 445/tcp.
A (now slightly dated) document describing how pthread scheduling works with FreeBSD and Linux
Other stuff, miscellaneous script, etc.