IPLIST.NET - 21.173.in-addr.arpa

Search for IP or hostnames:

21.173.in-addr.arpa checked at 2025-10-28T00:26:14.645Z 110ms 64/64/64 100% R:10

`21.173.in-addr.arpa`

NS	`pdns104.ultradns.biz`
		A	2610:a1:1015::8c ^{🇺🇸 Neustar}
			PTR	`pdns104.ultradns.biz`
		A	156.154.66.104^{🇺🇸 Neustar}
			PTR	`pdns104.ultradns.biz`
NS	`pdns104.ultradns.com`
		A	2001:502:f3ff::8c ^{🇺🇸 Neustar}
			PTR	`pdns104.ultradns.com`
		A	156.154.64.104^{🇺🇸 Neustar}
			PTR	`pdns104.ultradns.com`
NS	`pdns104.ultradns.net`
		A	2610:a1:1014::8c ^{🇺🇸 Neustar}
			PTR	`pdns104.ultradns.net`
		A	156.154.65.104^{🇺🇸 Neustar}
			PTR	`pdns104.ultradns.net`
NS	`pdns104.ultradns.org`
		A	2001:502:4612::8c ^{🇺🇸 Neustar}
			PTR	`pdns104.ultradns.org`
		A	156.154.67.104^{🇺🇸 Neustar}
			PTR	`pdns104.ultradns.org`

`173.in-addr.arpa`

	NS	`r.arin.net`
	NS	`u.arin.net`
	NS	`x.arin.net`
	NS	`y.arin.net`
	NS	`z.arin.net`
	NS	`arin.authdns.ripe.net`

Starts with same word

21.ca

21.org

21.co.uk

21.vc

21.am

21.rs

21.com

21.bet

21.center

21.kz

21.web.app

21.su

21.network

21.si

21.ph

21.is

21.be

21.com.ua

21.pe

21.edu.ar

21.gg

21.capital

21.dk

21.email

21.sk

21.immo

21.cz

21.style

21.nl

21.agency

21.co

21.biz

21.lv

21.ru

21.finance

21.ax

21.nu

21.business

21.casino

21.pl

21.ee

21.tv

21.partners

21.to

21.ie

21.photos

21.cc

21.fr

21.by

21.com.es

21.life

21.run

21.org.cn

21.net

21.la

21.diamonds

21.cn

21.de

21.training

Starts similarily

12.net

12.la

21.bet

12.at

21.center

21.kz

12.ws

12.s3.amazonaws.com

21.web.app

21.su

21.network

21.si

21.ph

12.lv

21.is

21.be

21.com.ua

12.cl

12.ph

12.ma

12.rs

21.pe

21.edu.ar

21.gg

21.capital

12.de

12.in-addr.arpa

21.dk

12.ag

21.email

12.kz

12.com.ua

21.sk

12.cz

21.immo

12.eu

21.cz

12.uk

12.life

21.style

12.city

12.dk

21.nl

21.agency

12.org.ru

12.nu

21.co

21.biz

21.lv

21.ru

12.ai

21.finance

12.hk

21.ax

12.amsterdam

12.fr

21.nu

21.business

12.vc

21.casino

21.pl

21.ee

12.am

12.agency

12.digital

12.ac.cn

12.lt

21.tv

12.si

21.partners

21.to

21.ie

21.photos

21.cc

12.be

12.fi

12.cc

12.is

21.fr

12.chat

21.by

12.solutions

12.dyndns.tv

21.com.es

21.life

12.cm

21.run

12.world

21.org.cn

12.by

21.net

12.org.ua

12.works

12.uz

21.la

21.diamonds

21.cn

21.de

21.training

21.ca

12.ca

21.org

12.ru

21.co.uk

12.limo

21.vc

21.am

12.biz

21.rs

12.to

21.com

AI analysis

21.173.in-addr.arpa delegates to four name servers: pdns104.ultradns.biz, pdns104.ultradns.com, pdns104.ultradns.net and pdns104.ultradns.org.

21.173.in-addr.arpa at least partially shares name servers with other domains, including 207.64.97.in-addr.arpa, aibet7.com, stratostel.net, sugarmobile.eu and 218.119.192.in-addr.arpa.

These name servers are often used with ns68.ultradns2.com and ns68.ultradns2.org.

Host names with two IP numbers: pdns104.ultradns.biz points to 2610:a1:1015::8c and 156.154.66.104; pdns104.ultradns.com points to 2001:502:f3ff::8c and 156.154.64.104; pdns104.ultradns.net points to 2610:a1:1014::8c and 156.154.65.104; pdns104.ultradns.org points to 2001:502:4612::8c and 156.154.67.104.

dbq