easily lookup domain name whois records and DNS information for any top level domain name or IP address block
How (and Why) to Change Your DNS Server | PCMag May 17, 2019 network manager - What do I put in the "Search Domains More accurately: It's a list of domains that the DNS resolver will append to a hostname when attempting to resolve it to an IP address. For example, let's say you manager a bunch of servers at mycompany.com (web1.mycompany.com, web2.mycompany.com, db.mycompany.com, etc), and you're tired of typing the fully-qualified domain name every time you need to ping them or SSH to them. Domain Name Search & Domain Name Registration | Network Your domain name — it's how the online world finds you. A domain name, or Web address, is an address where you can be found online. It's how you'll express yourself through email or your website and it's what customers think of when trying to find you.
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More accurately: It's a list of domains that the DNS resolver will append to a hostname when attempting to resolve it to an IP address. For example, let's say you manager a bunch of servers at mycompany.com (web1.mycompany.com, web2.mycompany.com, db.mycompany.com, etc), and you're tired of typing the fully-qualified domain name every time you need to ping them or SSH to them. Domain Name Search & Domain Name Registration | Network
If you are looking for a domain, WhoIs domain lookup can tell you if it's already owned by another entity and provide contact information for the domain name owner. WhoIs domain information can help you determine the proper contact for any domain listed in the Whois database.
A search domain provides a default domain name for searches. If you provide example.net and example.com as search domains and try to contact the host server1, the system will look for server1.example.net and server1.example.com without you having to type out the full domain.