xnnd.com tools for dns
DNS Lookup: Multi DNS?

Checking PTR record for 54.236.55.100 using Cloudfare DNS server (1.0.0.1): (or click here to check using the Google DNS website.)
100.55.236.54.in-addr.arpa domain name pointer ec2-54-236-55-100.compute-1.amazonaws.com.

Sender Score for IP 54.236.55.100 is n/a.
Scan reverse DNS for 54.236.55.0/24.
Query ARIN for 54.236.55.100.

Spamtrap grade: A
Did you receive spam from ec2-54-236-55-100.compute-1.amazonaws.com?
Try looking up where to send a spam report using abuse.net.
Or check ARIN and look for an abuse contact.

Multi DNS Options: No/off=Check one random public server. Yes=Check public DNS servers. Special=Check DNS servers authoritative for zone/domain.

Run at: Thu Apr 15 22:56:33 EDT 2021

 xnnd simple tools for dns since 2008