.local

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local
TLD type Pseudo-domain-style host suffix
Status Not in root but used by the mDNS protocol.
Registry Machines on the local net can automatically register an address.
Intended use network discovery and configuration
Actual use Local Area Network name resolution
Documents Developer page
Website Mac OS X features

local is a pseudo-top-level domain used in multicast domain name service (mDNS) of zero configuration networking discovery protocols.

Apple's Bonjour implements mDNS, as does Avahi. If a computer running Mac OS X is not assigned a domain name, it identifies itself as hostname.local.

Name resolution issues may arise if multicast DNS software is used in conjunction with a network that implements the local toplevel DNS domain.

Despite not being a valid top-level domain in the Internet, considerable DNS traffic that queries the local domain exists in the public Domain Name System.[1] In June 2009, the L root server received more than 400 such queries per second,[2] ranking 4th in DNS traffic of all TLDs after COM, ARPA, and NET.

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