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Linux Commands#network
dig - How to use dig command in Linux
How to use nslookup Commands on Linux
DNS lookup utility
| Operation | Command | Example |
|---|---|---|
| lookups – mapping names to addresses | host HOST | host google.com |
| Reverse lookups – mapping addresses to names | host IP_ADDRESS | host 192.168.0.10 |
| lookups at DNS Server | host HOST SERVER | host google.com 8.8.8.8 |
| lookups at DNS Server | host IP SERVER | host 74.125.235.101 8.8.8.8 |
| lookup for an any record | host -t any HOST | host -t any google.com |
| lookup for an soa record | host -t soa HOST | host -t soa google.com |
| lookup for an ns record | host -t ns HOST | host -t ns google.com |
| lookup for an a record | host -t a HOST | host -t a google.com |
| lookup for an mx record | host -t mx HOST | host -t mx google.com |
| lookup for an txt record | host -t txt HOST | host -t txt google.com |
| lookup for an any record -a is equivalent to -v -t ANY | host -a HOST | host -a google.com |
host [-t type] hostname [server]
# host
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 www.amazon.com www.amazon.com has address 205.251.242.103
#host -t mx amazon.com amazon.com mail is handled by 5 amazon-smtp.amazon.com.
#host -t soa amazon.com amazon.com has SOA record dns-external-master.amazon.com. root.amazon.com. 2010113059 180 60 3024000 60 #host -t soa aws.com aws.com has SOA record ns-1490.awsdns-58.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
#host -t any aws.com aws.com has SPF record "v=spf1 include:spf.intermedia.net ~all" aws.com descriptive text "v=spf1 include:spf.intermedia.net ~all" aws.com mail is handled by 20 mx2.smtp.exch022.serverdata.net. aws.com mail is handled by 10 mx1.smtp.exch022.serverdata.net. aws.com has SOA record ns-1490.awsdns-58.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400 aws.com has address 184.72.117.127 aws.com has address 54.209.129.73 aws.com name server ns-1490.awsdns-58.org. aws.com name server ns-527.awsdns-01.net. aws.com name server ns-139.awsdns-17.com. aws.com name server ns-1818.awsdns-35.co.uk.
#host -a aws.com Trying "aws.com" ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 53311 ;; flags: qr rd ra; QUERY: 1, ANSWER: 11, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;aws.com. IN ANY ;; ANSWER SECTION: aws.com. 86211 IN SPF "v=spf1 include:spf.intermedia.net ~all" aws.com. 86211 IN TXT "v=spf1 include:spf.intermedia.net ~all" aws.com. 1011 IN MX 10 mx1.smtp.exch022.serverdata.net. aws.com. 1011 IN MX 20 mx2.smtp.exch022.serverdata.net. aws.com. 711 IN SOA ns-1490.awsdns-58.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400 aws.com. 86211 IN A 184.72.117.127 aws.com. 86211 IN A 54.209.129.73 aws.com. 172611 IN NS ns-1818.awsdns-35.co.uk. aws.com. 172611 IN NS ns-527.awsdns-01.net. aws.com. 172611 IN NS ns-1490.awsdns-58.org. aws.com. 172611 IN NS ns-139.awsdns-17.com. Received 421 bytes from 192.168.0.1#53 in 9 ms
Linux Commands#network
dig - How to use dig command in Linux
How to use nslookup Commands on Linux