domain name system - Reverse DNS query of public IP returns localhost

I'm seeing this unusual behavior with reverse DNS lookups on this public IP Address: 222.253.228.79. Can someone explain what's going on?

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MXToolbox PTR lookup resolved localhost as the domain

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ping -a is even stranger; it resolved it to my local PC name (clifford):

ping -a 222.253.228.79
Pinging clifford [222.253.228.79] with 32 bytes of data:

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nslookup via Google's public 8.8.8.8 DNS server also resolves it to localhost:

nslookup 222.253.228.79 8.8.8.8
Server:  google-public-dns-a.google.com
Address:  8.8.8.8

Name:    localhost
Address:  222.253.228.79