create a DNS name that changes to match their host IP as the IP address is changed periodically by their ISP's DHCP server. New TLDs New gTLDs are prohibited from publishing wildcards (or using equivalent name server mechanisms) by specification 6 of the ICANN New gTLD Base Registry agreement. However, ICANN's Name Collision Occurrence Management Framework (PDF), explicitly requires new gTLDs to publish (for at least 90 days) special MX, SRV, TXT, and 127.0.53.53 A record wildcards that warn of potential name collisions due to use of relative domain names with domain search paths. Registries/ISPs Several domain name registrars have, at various times, deployed wildcard records for the top-level domains to provide a platform for advertising, most notably VeriSign for .com and .net with its (now removed) Site Finder system. The .museum TLD also had a wildcard record which has now been removed. , top-level domains using a wildcard A record (other than 127.0.53.53) are .fm, .la, .ph, .pw, .vg and .ws. The internationalized TLDs .中国 ( or for "China") and .გე ( for the Georgian letters for the Georgian country code "GE") also have wildcard A records. The *.中国 wildcard resolves to ibaidu.com (flagged by Chrome as unsafe), and the *.გე wildcard resolves to a website of the .ge TLD. It has also become common for ISPs to synthesize address records for typos, for the same person, a practice called "catchall" typosquatting, but these aren't true wildcards, but rather modified caching name servers. Ignoring wildcards from others The Internet Software Consortium produced a version of the BIND DNS software that can be configured to filter out wildcard DNS records from specific domains. Various developers have produced software patches for BIND and for djbdns. Other DNS server programs have followed suit, providing the ability to ignore wildcard DNS records as configured. References External links IAB Commentary: Architectural Concerns on the use of DNS Wildcards Domain Name System