104.155.138.21

• RIPE4 21.138.155.104.in-addr.arpa
• PTR21.138.155.104.bc.googleusercontent.com expired since 1 week, 1 day
• Records pointing here:
• Ans7.cosmofon.net.mk
• Aquksdns10.net expired since 18 hours, 51 minutes
• Anocserver.net expired since 5 days, 22 hours
• Asamviceg3jahws2.biz expired since 5 days, 23 hours
• A111-tataidc.co.in expired since 6 days, 18 hours
• Adnsget.top expired since 1 week
• Ans3.nocserver.net expired since 1 week
• Ans2.111-tataidc.co.in expired since 1 week
• Ans6.mentora.biz expired since 1 week
• Aelinx.com.tw expired since 1 week
• Ans4.ipdomain.bid expired since 1 week, 1 day
• Ans3.ptwebserv.net expired since 1 week, 1 day
• Awww.hypnet.pl expired since 1 week, 1 day
• Ad-zone.biz expired since 1 week, 1 day
• Awww.ns4.ipdomain.bid expired since 1 week, 1 day
• Awww.ns7.ipdomain.bid expired since 1 week, 1 day
• A91.unknown.steephost.net expired since 1 week, 1 day
• Awww.ns6.nocserver.net expired since 1 week, 1 day
• Awww.ns3.ais-idc.co expired since 1 week, 1 day
• Aipdomain.bid expired since 1 week, 1 day
• Show 1 expired records

This top-level domain has no publically available whois server. Try going to www.nic.arpa.