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Sunday, 16 July 2017

host Linux Command

host

host [options] name [server]

Description

System administration command. Print information about hosts or zones in DNS. Hosts may be IP addresses or hostnames; host converts IP addresses to hostnames by default and appends the local domain to hosts without a trailing dot. Default servers are determined in /etc/resolv.conf. For more information about hosts and zones, read Chapters 1 and 2 of DNS and BIND (O'Reilly).

Options

-a
Same as -t ANY.

-c class
Search for specified resource record class (IN, CH, CHAOS, HS, HESIOD, or ANY). Default is IN.

-d
Verbose output. Same as -v.

-l
List mode. This also performs a zone transfer for the named zone. Same as -t AXFR.

-n
Perform reverse lookups for IPv6 addresses using IP6.INT domain and "nibble" labels instead of IP6.ARPA and binary labels.

-r
Do not ask contacted server to query other servers, but require only the information that it has cached.

-t type
Look for type entries in the resource record. type may be any recognized query type, such as A, AXFR, CNAME, NS, SOA, SIG, or ANY. If name is a hostname, host will look for A records by default. If name is an IPv4 or IPv6 address, it will look for PTR records.

-v
Verbose. Include all fields from resource record, even time-to-live and class, as well as "additional information" and "authoritative nameservers" (provided by the remote nameserver).

-w
Never give up on queried server.

-C
Display SOA records from all authoritative nameservers for the specified zone.

-N n
Consider names with fewer than n dots in them to be relative. Search for them in the domains listed in the search and domain directives of /etc/resolv.conf. The default is usually 1.

-R n
Retry query a maximum of n times. The default is 1.

-T
Use TCP instead of UDP to query nameserver. This is implied in queries that require TCP, such as AXFR requests.

-W n
Wait a maximum of n seconds for reply.
Annamalai Thangaraj

Annamalai is working as Technical Lead in Leading Telecom company with 5+ years experience in Identity and Access Management , Telecom and Networks, BigData, Java, Spring, Struts, Hibernate, AngularJS, and Enterprise Web Application Development.

Website: Java Tutorials Corner

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Item Reviewed: host Linux Command Rating: 5 Reviewed By: Annamalai Thangaraj