Linux系统之host命令的基本使用

[root@jeven ~]# host --help
host: illegal option -- -
Usage: host [-aCdlriTwv] [-c class] [-N ndots] [-t type] [-W time]
            [-R number] [-m flag] hostname [server]
       -a is equivalent to -v -t ANY
       -c specifies query class for non-IN data
       -C compares SOA records on authoritative nameservers
       -d is equivalent to -v
       -l lists all hosts in a domain, using AXFR
       -i IP6.INT reverse lookups
       -N changes the number of dots allowed before root lookup is done
       -r disables recursive processing
       -R specifies number of retries for UDP packets
       -s a SERVFAIL response should stop query
       -t specifies the query type
       -T enables TCP/IP mode
       -v enables verbose output
       -w specifies to wait forever for a reply
       -W specifies how long to wait for a reply
       -4 use IPv4 query transport only
       -6 use IPv6 query transport only
       -m set memory debugging flag (trace|record|usage)

host(选项)(参数)

-a：显示详细的DNS信息；
-c<类型>：指定查询类型，默认值为“IN“；
-C：查询指定主机的完整的SOA记录；
-r：在查询域名时，不使用递归的查询方式；
-t<类型>：指定查询的域名信息类型；
-v：显示指令执行的详细信息；
-w：如果域名服务器没有给出应答信息，则总是等待，直到域名服务器给出应答；
-W<时间>：指定域名查询的最长时间，如果在指定时间内域名服务器没有给出应答信息，则退出指令；
-4：使用IPv4；
-6：使用IPv6.

[root@jeven ~]# host www.baidu.com
www.baidu.com is an alias for www.a.shifen.com.
www.a.shifen.com has address 153.3.238.110
www.a.shifen.com has address 153.3.238.102
www.a.shifen.com has IPv6 address 2408:873d:22:1a01:0:ff:b087:eecc
www.a.shifen.com has IPv6 address 2408:873d:22:18ac:0:ff:b021:1393

[root@jeven ~]# host 8.8.8.8
8.8.8.8.in-addr.arpa domain name pointer dns.google.

[root@jeven ~]# host -a www.baidu.com
Trying "www.baidu.com"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58685
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 5, ADDITIONAL: 9

;; QUESTION SECTION:
;www.baidu.com.			IN	ANY

;; ANSWER SECTION:
www.baidu.com.		1200	IN	CNAME	www.a.shifen.com.

;; AUTHORITY SECTION:
baidu.com.		1200	IN	NS	ns2.baidu.com.
baidu.com.		1200	IN	NS	ns4.baidu.com.
baidu.com.		1200	IN	NS	ns3.baidu.com.
baidu.com.		1200	IN	NS	dns.baidu.com.
baidu.com.		1200	IN	NS	ns7.baidu.com.

;; ADDITIONAL SECTION:
dns.baidu.com.		600	IN	A	110.242.68.134
ns2.baidu.com.		86400	IN	A	220.181.33.31
ns3.baidu.com.		86400	IN	A	36.155.132.78
ns3.baidu.com.		86400	IN	A	153.3.238.93
ns4.baidu.com.		86400	IN	A	14.215.178.80
ns4.baidu.com.		86400	IN	A	111.45.3.226
ns7.baidu.com.		86400	IN	A	180.76.76.92
ns7.baidu.com.		86400	IN	AAAA	240e:bf:b801:1002:0:ff:b024:26de
ns7.baidu.com.		86400	IN	AAAA	240e:940:603:4:0:ff:b01b:589a

Received 316 bytes from fd58:bc95:d4fb::1#53 in 62 ms

[root@jeven ~]# host -t  NS www.baidu.com
www.baidu.com is an alias for www.a.shifen.com.

[root@jeven ~]# host -v 8.8.8.8
Trying "8.8.8.8.in-addr.arpa"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 8153
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;8.8.8.8.in-addr.arpa.		IN	PTR

;; ANSWER SECTION:
8.8.8.8.in-addr.arpa.	38514	IN	PTR	dns.google.

Received 62 bytes from 192.168.3.254#53 in 3 ms