Robtex is a service which gathers public information about IP addresses, domain names, host names, Autonomous systems, and more.
How to use
1. Access https://www.robtex.com/dns-lookup and search for the domain

2. In the results we can find
Analysis
- DNS servers
- Mail servers
- IP address

Quick Info
- FQDN
- DNS servers

Records
- Analysis of DNS query record type (MX, A, NS, etc)

Shared
- IP addresses
- DNS servers
- DNS servers IP address
- Mail Servers
- Mail Servers IP address

Graph
- Displays a map of the results
