It's a bash script to show a complete DNS lookup of a domain and it might be useful for Linux system/support engineers who handled client support. I believe it helps for these guys to troubleshoot or easy way to find all the details in a single click.
- DNS Lookup Script for troubleshooting
- Including almost DNS Related commands in a single script
- Including whois details and telnet conncetivity (so need to install both that the packages)
For-RedHat-Distributer
sudo yum update
sudo yum -y install git
sudo yum -y install bind-utils
sudo yum -y install telnet
sudo yum -y install whois
sudo yum -y install ncFor-Debian-Distributer
sudo apt update
sudo apt -y install git
sudo apt -y install dnsutils
sudo apt -y install telnet
sudo apt -y install whois
sudo apt -y install ncPlease note that this script is not supporting with macOS.
git clone https://github.com/yousafkhamza/dns-lookup-bash-script
cd dns-lookup-bash-script
chmod +x dt.shAlias Assgning for this script
echo "alias dg='bash $(pwd)/dt.sh'" >> ~/.bashrc
source ~/.bashrcdg geekflare.com #<--------------- Before set alias
or
bash dt.sh geekflare.com #<-------------- On the Sript directory# dg geekflare.com
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Dig +trace result of the geekflare.com
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
geekflare.com. 30 IN A 104.27.118.115
geekflare.com. 30 IN A 104.27.119.115
geekflare.com. 86400 IN DS 2371 13 2 CBAA2018F41B29985DAEDE7F127D4F9626ADA609665CEBAB0011903B 7C639254
geekflare.com. 172800 IN NS olga.ns.cloudflare.com.
geekflare.com. 172800 IN NS todd.ns.cloudflare.com.
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
MX Record Result of the geekflare.com
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
geekflare.com. 300 IN MX 10 alt3.aspmx.l.google.com.
geekflare.com. 300 IN MX 10 alt4.aspmx.l.google.com.
geekflare.com. 300 IN MX 1 aspmx.l.google.com.
geekflare.com. 300 IN MX 5 alt1.aspmx.l.google.com.
geekflare.com. 300 IN MX 5 alt2.aspmx.l.google.com.
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
TXT Record Resutl of the geekflare.com
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
geekflare.com. 300 IN TXT "google-site-verification=MRSwa454qay1S6pwwixzoiZl08kfJfkhiQIslhok3-A"
geekflare.com. 300 IN TXT "ahrefs-site-verification_8eefbd2fe43a8728b6fd14a393e2aff77b671e41615d2c1c6fc365ec33a4d6d0"
geekflare.com. 300 IN TXT "yandex-verification: 42f25bad396e79f5"
geekflare.com. 300 IN TXT "v=spf1 include:_spf.google.com include:mailgun.org ~all"
geekflare.com. 300 IN TXT "google-site-verification=7QXbgb492Y5NVyWzSAgAScfUV3XIAGTKKZfdpCvcaGM"
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
PTR record result of the 104.27.118.115
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Telnet trying to connect that IP Result of the alt3.aspmx.l.google.com
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
IP: 172.217.194.27
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Telnet Result of IP: 104.27.118.115 && MX: alt3.aspmx.l.google.com and checking both 25 & 587
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
IP:
------
MX: 220 mx.google.com ESMTP 26si18015154pgs.402 - gsmtp
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
WHOIS Result of the geekflare.com
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Registrar URL: http://www.cloudflare.com
Registry Expiry Date: 2025-01-07T14:14:12Z
Registrar: CloudFlare, Inc.
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Name Server: OLGA.NS.CLOUDFLARE.COM
Name Server: TODD.NS.CLOUDFLARE.COM
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx#!/bin/bash
domain=$1
if [ -z "$domain" ]
then
echo "Please specify a FQDN. eg:('google.com')"
exit 1
elif [[ "$domain" =~ ^http://* ]] || [[ "$domain" =~ ^https://* ]]
then
echo "Please specify a FQDN without Protocol and Symbols. eg:('google.com')"
exit 1
elif grep -oP '^((?!-)[A-Za-z0-9-]{1,63}(?<!-)\.)+[A-Za-z]{2,6}$' <<< "$domain" >/dev/null 2>&1;
then
#dig +trace domain
echo "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
echo "Dig +trace result of the $domain"
echo "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
dig +nocmd $domain a +noall +answer >> ~/digtrace
dig +nocmd $domain ns +noall +answer >> ~/digtrace
dig +trace @8.8.8.8 $domain | grep "$domain." | grep -vE 'RRSIG|;' >> ~/digtrace
cat ~/digtrace | sort | sort -u -k 5 && rm -f ~/digtrace
#MX Record
echo "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
echo "MX Record Result of the $domain"
echo "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
#dig +nocmd $domain txt +noall +answer
dig +nocmd $domain mx +noall +answer | sort -k 5
#TXT Record
echo "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
echo "TXT Record Resutl of the $domain"
echo "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
#dig txt $domain | grep ^"$domain" | grep TXT
dig +nocmd $domain txt +noall +answer
IP=`dig +nocmd $domain a +noall +answer | grep ^"$domain" | grep A | awk {'print $5'} | head -n1`
#IP=`dig $domain | grep ^"$domain" | grep A | awk {'print $5'} | head -n1`
#host for IP
echo "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
echo "PTR record result of the $IP"
echo "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
#host $IP | awk {'print $5'}
dig -x $IP +noall +answer | grep -vE ^";|^$"
MX=`dig +nocmd $domain mx +noall +answer | grep ^"$domain" | grep MX | awk {'print $6'} | rev | cut -c2- | rev | head -n1`
#MX=`dig mx $domain | grep ^"$domain" | grep MX | awk {'print $6'} | rev | cut -c2- | rev | head -n1`
#MX Trying IP Resutl
echo "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
echo "Telnet trying to connect that IP Result of the $MX"
echo "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
echo "IP: `timeout 1 telnet $MX 587 > ~/Try; timeout 1 telnet $MX 25 >> ~/Try; cat ~/Try | grep -v -e '^$'| grep Trying | head -n1 | awk {'print $2'} | rev | cut -c4- |rev; rm -f ~/Try`"
#Netcatch Result for MX 25 & 587
echo "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
echo "Telnet Result of IP: $IP && MX: $MX and checking both 25 & 587"
echo "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
echo "IP: `timeout 3 nc $IP 587 > ~/rre; timeout 1 nc $IP 25 >> ~/rre; cat ~/rre | grep -v -e '^$'| head -n1; rm -f ~/rre`"
echo " ------"
echo "MX: `timeout 3 nc $MX 587 > ~/rre; timeout 1 nc $MX 25 >> ~/rre; cat ~/rre | grep -v -e '^$'| head -n1; rm -f ~/rre`"
#WHOIS Result for Domain
echo "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
echo "WHOIS Result of the $domain"
echo "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
whois $domain | grep -E "Registrar:|Registry Expiry Date:|Registrar URL:|Name Server:|Expiration Date:|Status:|URL:"
echo "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
else
echo "Please enter a valid FQDN. eg:('google.com')"
fiPlease note that I didn't use "dig +short" because I need to get the complete domain name and result so that's why I used this. If anyone comfertable with that kind of commands please be look and change the same as above file who needs to require that.
- dig
- dig +trace
- telnet
- nc
- whois
It's a simple bash script for complete DNS lookup details in a sing click. I hope it's useful for those who handle client support. Please let me know if you are facing any issues while using this script. Also, you guys can reach me out with the below contact details.
