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To quote from the SourceForge project description: gh-tool is a command-line interface to gethostby*, in libresolv/libc. It allows one to check the local system's notion of an IP->DNS or DNS->IP mapping, including aliases, directly, rather than digging for mappings in DNS, which may or may not be relevant.

fpdns - Fingerprinting DNS servers A nameserver basically responds to a query. Interoperability is an obvious requirement here. The standard protocol behaviour of different DNS implementations is expected to be the same. Requirements for protocol behaviour of DNS implementations is widely documented in the case of 'common' dns messages. The DNS protocol is over 20 years old and since its inception, there have been over 40 independent DNS implementations, while some implementations have over 20 versions. The methodology used to identify individual nameserver implementations is based on "borderline" protocol behaviour. The DNS protocol offers a multitude of message bits, response types, opcodes, classes, query types and label types in a fashion that makes some mutually exclusive while some are not used in a query messages at all. Not every implementation offers the full set of features the DNS protocol set currently has. Some implementations offer features outside the protocol set, and there are implementations that do not conform to standards.

The 'idnkit' is an open source, BSD-like licensed software that provides functionalities about Internationalized Domain Name processing standardized at IETF. Major features that idnkit provides are as follows. * libidnkit Core library for IDN processing. * libidnkitlite Light Weight library for IDN processing. (UTF-8 only) * idnconv DNS zone / configuration file encoding converter. * runidn / idn wrapper Dynamic link resolver library for UNIX / Windows. * BIND 9 patch IDN enhancements for BIND 9 DNS lookup tools.

[from web site] This is a simple Python script to register your dynamic IP address using the NIC V2.0 protocol. We aim to be fully compliant with the dyndns client specification. Starting with version 0.141, we use https by default and will fall back to plain http if a timeout occurs. We currently support all options and latest recommendations by Dyndns. Ipcheck is easy to install and very easy to use. Root access is not required and no configuration files are needed. Just specify your username, password and hostname(s) on the command line (or cron entry). You can specify the interface (default tun0) to search for your ip address on or use web based IP detection. There is also direct support for determining the IP address on the following devices: Linksys (-L), Netgear (-N), Draytek (-D), Netopia (-O), HawkingTech (-H), Cisco 667i (-C), Cisco 700 series (-I), ZyXEL Prestige (-Z), SMC Barricade (-S)

pear-Net_DNS2 provides (roughly) the same functionality as Net_DNS, but using PHP5 objects, exceptions for error handling, better sockets support. This release is (in most cases) 2x - 10x faster than Net_DNS, as well as includes more RR's (including DNSSEC RR's), and improved sockets and streams support.

The libbind functions have been separated from the BIND suite as of BIND 9.6.0. Originally from older versions of BIND, they have been continually maintained and improved but not installed by default with BIND 9. This standard resolver library contains the same historical functions and headers included with many Unix operating systems. In fact, most implementations are based on the same original code. ISC's libbind provides the standard resolver library, along with header files and documentation, for communicating with domain name servers, retrieving network host entries from /etc/hosts or via DNS, converting CIDR network addresses, performing Hesiod information lookups, retrieving network entries from /etc/networks, implementing TSIG transaction/request security of DNS messages, performing name-to-address and address-to-name translations, and utilizing /etc/resolv.conf for resolver configuration.

This port contains a subset of djbdns (net/djbdns) - a DNS client library released to the public domain by its author. The library was packaged by Gerrit Pape. The port contains both static and shared versions of the DNS client library.

from nsping.8: Nsping uses DNS queries to monitor reachability and operation of name- servers, as well as the latency of DNS queries. It does this by sending random recursive DNS queries to the nameserver (avoiding the effects of DNS caching) and measuring the amount of time between the sending of the query and the receipt of the response packet.

OpenDD is a DynDNS client, written in C, and especially designed for small gateway machines, like a Soekris box. Its main feature is that it does not require any Perl or Python interpreter. It supports HTTPS, can send a mail report, and can run as daemon. It is also very easy to deploy.

A resolver library used to communicate with a name server to perform DNS queries, zone transfers, dynamic DNS updates, etc. Creates an object hierarchy from a DNS server response, which allows you to view all of the information given by the DNS server. It bypasses the system resolver library and communicates directly with the server.