alt2.gmail-smtp-in.l.google.com has address 108.177.125.26
This page provides an online version of the OS hostname and whois commands. It allows you to retrieve publicly available DNS and Whois information for any website or hostname through a single interface.
Host Info
cleantalk.org:~$ host alt2.gmail-smtp-in.l.google.com
alt2.gmail-smtp-in.l.google.com has address 108.177.125.26
alt2.gmail-smtp-in.l.google.com has IPv6 address 2404:6800:4008:c01::1b
Whois info
cleantalk.org:~$ whois alt2.gmail-smtp-in.l.google.com
We couldn’t get the data. It may be missing or temporarily unavailable.