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libasyncns is a C library for Linux/Unix for executing name service queries asynchronously. It is an asynchronous wrapper around getaddrinfo(3), getnameinfo(3), res_query(3) and res_search(3) from libc and libresolv. In contrast to GNU's asynchronous name resolving API getaddrinfo_a(), libasyncns does not make use of UNIX signals for reporting completion of name queries. Instead, the API exports a standard UNIX file descriptor which may be integerated cleanly into custom main loops. In contrast to asynchronous DNS resolving libraries like libdenise, skadns, adns, libasyncns is just an asynchronous wrapper around the libc's synchronous getaddrinfo() API, which has the advantage of allowing name resolution using techniques like Multicast DNS, LDAP or NIS using standard libc NSS (Name Service Switch) modules. libasyncns is compatible with IPv6 if the underlying libc is. libasyncns is very tiny, consisting of just one header and one source file. It has no dependencies besides libc.

libasyncns is a C library for Linux/Unix for executing name service queries asynchronously. It is an asynchronous wrapper around getaddrinfo(3), getnameinfo(3), res_query(3) and res_search(3) from libc and libresolv. In contrast to GNU's asynchronous name resolving API getaddrinfo_a(), libasyncns does not make use of UNIX signals for reporting completion of name queries. Instead, the API exports a standard UNIX file descriptor which may be integerated cleanly into custom main loops. In contrast to asynchronous DNS resolving libraries like libdenise, skadns, adns, libasyncns is just an asynchronous wrapper around the libc's synchronous getaddrinfo() API, which has the advantage of allowing name resolution using techniques like Multicast DNS, LDAP or NIS using standard libc NSS (Name Service Switch) modules. libasyncns is compatible with IPv6 if the underlying libc is. libasyncns is very tiny, consisting of just one header and one source file. It has no dependencies besides libc.

Multithreaded perl script to enumerate DNS information of a domain and discover non-contiguous IP blocks. OPERATIONS: Get the host's address (A record). Get the nameservers (threaded). Get the MX record (threaded). Perform axfr queries on nameservers and get BIND VERSION (threaded). Get extra names and subdomains via google scraping (google query = "allinurl: -www site:domain"). Brute force subdomains from file, can also perform recursion on subdomain that have NS records (all threaded). Calculate C class domain network ranges and perform whois queries on them (threaded). Perform reverse lookups on netranges ( C class or/and whois netranges) (threaded). Write to domain_ips.txt file ip-blocks.

ez-ipupdate is a small utility for updating your host name if you are using any of the following dynamic DNS services: http://gnudip.cheapnet.net (GNUDip) http://www.dhs.org http://www.dyn.ca (GNUDip) http://www.dyndns.org http://www.dyns.cx http://www.easydns.com http://www.ez-ip.net http://www.hn.org http://www.justlinux.com http://www.ods.org http://www.tzo.com http://www.zoneedit.com It is pure C and works on Linux, *BSD and Solaris. The key features are: support for multiple service types, daemon mode that monitors your IP address and only sends updates when your IP address changes.

The dnsreflector daemon listens for DNS queries on a local UDP port and answers with records pointing back to localhost. Combined with packet filter pf(4) this works as a bandwidth efficient spamtrap.

Easyzone is a package to manage the common record types of a zone file, including SOA records. This module sits on top of the dnspython package and provides a higher level abstraction for common zone file manipulation use cases.

Twisted Names is both a domain name server as well as a client resolver library. Twisted Names comes with an "out of the box" nameserver which can read most BIND-syntax zone files as well as a simple Python-based configuration format. Twisted Names can act as an authoritative server, perform zone transfers from a master to act as a secondary, act as a caching nameserver, or any combination of these. Twisted Names' client resolver library provides functions to query for all commonly used record types as well as a replacement for the blocking gethostbyname() function provided by the Python stdlib socket module. Twisted Names is available under the MIT Free Software licence.

Hesiod is part of MIT's Athena Project. Hesiod can provide general name service for a variety of applications and is based on the Berkeley Internet Name Daemon (BIND). Jacques Vidrine <n@nectar.com>

Validns is a standalone command line RFC 1034/1035 zone file validation tool that, in addition to basic syntactic and semantic zone checks, includes DNSSEC signature verification and NSEC/NSEC3 chain validation, as well a number of optional policy checks on the zone.

fstrm is an optimized C implementation of Frame Streams that includes a fast, lockless circular queue implementation and exposes library interfaces for setting up a dedicated Frame Streams I/O thread and asynchronously submitting data frames for transport from worker threads. It was originally written to facilitate the addition of high speed binary logging to DNS servers written in C using the dnstap log format.