Domain Name System
DNS uses UDP port 53 as default and TCP port 53 as fallback.
nslookup
nslookup -type=txt youtube.com nslookup -type=mx google.com
dig
dig youtube.com txt
host - DNS lookup utility
host -t txt google.com
Check PTR text record
PS C:\Users\Administrator> nslookup -type=ptr 173.82.240.78 Server: UnKnown Address: 2402:800:20ff:6666::1 Non-authoritative answer: 78.240.82.173.in-addr.arpa name = mx2.practicehabits.net PS C:\Users\Administrator>
Check DMARC text record
PS C:\Users\Administrator> nslookup -type=txt _dmarc.practicehabits.net
Server: UnKnown
Address: 2402:800:20ff:6666::1
Non-authoritative answer:
_dmarc.practicehabits.net text =
"v=DMARC1; p=reject; rua=mailto:postmaster@practicehabits.net, mailto:postmaster@practicehabits.net"
PS C:\Users\Administrator> nslookup -type=txt _dmarc.2practice.xyz
Server: UnKnown
Address: 2402:800:20ff:6666::1
*** No text (TXT) records available for _dmarc.2practice.xyz