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DNS

Query and understand DNS records: A, AAAA, MX, TXT, CNAME, SPF, DKIM and DMARC. Plus checking propagation and finding errors during migrations.

16 one-liners: 16 harmless, 0 caution, 0 destructive

dns 16dig 15mail 6nameserver 2ptr 2

All DNS one-liners

Check a domain's DKIM key in DNS

$dig +short default._domainkey.example.com TXT
harmless

Check DNS propagation across public resolvers

$for ns in 1.1.1.1 8.8.8.8 9.9.9.9 208.67.222.222; do echo "$ns: $(dig +short @$ns example.com A | tr '\n' ' ')"; done
harmless

Check if a server IP is on the Spamhaus blacklist

$dig +short $(echo 203.0.113.10 | awk -F. '{print $4"."$3"."$2"."$1}').zen.spamhaus.org
harmless

Check the CAA record of a domain

$dig +short example.com CAA
harmless

Check whether DNSSEC works for a domain

$dig @1.1.1.1 +dnssec example.com SOA | grep -E "flags:|RRSIG|status:"
harmless

Compare the SOA serial on all nameservers

$for ns in $(dig +short example.com NS); do echo "$ns $(dig +short @$ns example.com SOA | awk '{print $3}')"; done
harmless

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Look up the MX records of a domain

$dig +short example.com MX
harmless

Look up the reverse DNS (PTR) of an IP address

$dig +short -x 203.0.113.10
harmless

Query a DNS record directly at the authoritative nameserver

$dig @$(dig +short example.com NS | head -n 1) example.com A +norecurse +short
harmless

Query any DNS record with its TTL

$dig example.com A +noall +answer
harmless

Show a domain's DNS zone in Plesk

#plesk bin dns --info example.com
harmless

Show the authoritative nameservers of a domain

$dig +short example.com NS
harmless

Show the DMARC policy of a domain

$dig +short _dmarc.example.com TXT
harmless

Show the SPF record of a domain

$dig +short example.com TXT | grep -i "v=spf1"
harmless

Trace DNS delegation from the root zone

$dig +trace example.com
harmless

Verify reverse DNS of a mail server IP (FCrDNS)

$ptr=$(dig +short -x 203.0.113.10 | head -n 1); echo "PTR: $ptr"; dig +short "$ptr" A
harmless

Read first, then run.

The commands on myline.de act directly on servers, files and databases. A wrong path or placeholder can delete data irreversibly or make a server unreachable.

  • All commands are provided without warranty and are not tested on every system.
  • Understand what a command does before running it, and check every placeholder.
  • Make a backup first and, if possible, try it on a test system.
  • You run commands at your own risk. Liability for damages is excluded to the extent permitted by law.