Reverse lookup for IP's

The real authoritative source is IANA and RIRs.

You can find the RIR quickly by first running an Internet Assigned Numbers Authority (IANA) WHOIS lookup.

https://www.iana.org/whois

Then check the relevant Regional Internet Registries (RIRs), such as ARIN Whois-RWS search.

There are various command line WHOIS tools that do this automatically for you.
rirmap.png

There's always Hurricane Electric:

https://bgp.he.net/

The truth can be found using the following brutal dig commands...

1) Lookup all NS records using dig (or equivalent tool or code on your OS)... for example...

imac> dig +short davidfavor.com ns
net11.wpfastsites.com.
net10.wpfastsites.com.
net12.wpfastsites.com.

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2) Then lookup each A record against each specific NS record...

imac> dig +short davidfavor.com a @net10.wpfastsites.com
144.217.34.8
imac> dig +short davidfavor.com a @net11.wpfastsites.com
144.217.34.8
imac> dig +short davidfavor.com a @net12.wpfastsites.com
144.217.34.8

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3) All IPs (or IP lists) should return the exact same values from each NS record.

4) If there's ever a mismatch, then DNS is munged + requires fixing, prior to proceeding with your next action.

Note: You must use dig or a DNS equivalent to get true values.

The only truth is to query global DNS yourself + check all the responses, per above.

Many Website tools will show problems with zero diagnostics.

The above dig commands provide you with exact diagnostics, just remove the +short option for detail.

refer this URL.

www.who.is

You can check all the information about the IP.