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nslookup operates in interactive or non-interactive mode. When used interactively by invoking it without arguments or when the first argument is - (minus sign) and the second argument is a hostname or Internet address of a name server, the user issues parameter configurations or requests when presented with the nslookup prompt (>).
The Web Proxy Auto-Discovery (WPAD) Protocol is a method used by clients to locate the URL of a configuration file using DHCP and/or DNS discovery methods. Once detection and download of the configuration file is complete, it can be executed to determine the proxy for a specified URL.
OpenDNS is an American company providing Domain Name System (DNS) resolution services—with features such as phishing protection, optional content filtering, and DNS lookup in its DNS servers—and a cloud computing security product suite, Umbrella, designed to protect enterprise customers from malware, botnets, phishing, and targeted online attacks.
DNS-SD (DNS Service Discovery [16]) allows clients to discover a named list of service instances and to resolve those services to hostnames using standard DNS queries. The specification is compatible with existing unicast DNS server and client software, but works equally well with mDNS in a zero-configuration environment.
Free Yes GPL: Simple DNS Plus: JH Software $79 – $379 No Clickwrap license: NSD: NLnet Labs Free Yes BSD variant Knot DNS: CZ.NIC: Free Yes GPL: Knot Resolver: CZ.NIC: Free Yes GPL: PowerDNS: PowerDNS.COM BV / Bert Hubert Free Yes GPL: MaraDNS: Sam Trenholme Free Yes BSD variant pdnsd: Thomas Moestl and Paul Rombouts Free Yes GPL: Posadis ...
It was founded as WebEx in 1995 and acquired by Cisco Systems in May 2007. Its headquarters are in San Jose, California. [2] Its software products include Webex App, Webex Suite, Webex Meetings, Webex Messaging, Webex Calling, Webex Contact Center, and Webex Devices. [3] All Webex products are part of the Cisco Systems collaboration portfolio. [4]
The preamble comprises a lookup of the Start of Authority (SOA) resource record for the "zone apex", the node of the DNS namespace that is at the top of the "zone". The fields of this SOA resource record, in particular the "serial number", determine whether the actual data transfer need to occur at all.
For example, to do a reverse lookup of the IP address 8.8.4.4 the PTR record for the domain name 4.4.8.8.in-addr.arpa would be looked up, and found to point to dns.google. If the A record for dns.google in turn pointed back to 8.8.4.4 then it would be said to be forward-confirmed.