DNSWHOIS.INFO - 21.255.128.in-addr.arpa

Search for IP or hostnames:

21.255.128.in-addr.arpa checked at 2025-10-08T17:30:06.448Z 761ms 60/60/60 100% R:19

`21.255.128.in-addr.arpa`

NS	`dns1.engr.uiowa.edu`
		A	2620:0:e50:7016::80ff:1113 ^{🇺🇸 University of Iowa}
			PTR	`dns1.icaen.uiowa.edu`
		A	128.255.17.19^{🇺🇸 University of Iowa}
			PTR	`dns1.icaen.uiowa.edu`
NS	`dns2.engr.uiowa.edu`
		A	2620:0:e50:7021::80ff:1514 ^{🇺🇸 University of Iowa}
			PTR	`dns2.engr.uiowa.edu`
		A	128.255.21.20^{🇺🇸 University of Iowa}
			PTR	`dns2.engr.uiowa.edu`
PTR	`rtr-sc02.engr.uiowa.edu`
		A	192.168.255.254
NS	`dns2.icaen.uiowa.edu`
		A	128.255.17.20^{🇺🇸 University of Iowa}
			PTR	`dns2.icaen.uiowa.edu`

`255.128.in-addr.arpa`

	NS	`dns-core-cb-1.uiowa.edu`
	NS	`dns-core-coph-1.uiowa.edu`
	NS	`dns-core-itf-1.uiowa.edu`
	NS	`dns-core-itf-2.uiowa.edu`
	NS	`dns-core-lc-0.uiowa.edu`
	NS	`dns-core-lc-1.uiowa.edu`
	NS	`dns-wireless-cb-1.uiowa.edu`
	NS	`dns-wireless-coph-1.uiowa.edu`
	NS	`dns-wireless-lc-1.uiowa.edu`
	NS	`dns1.uiowa.edu`
	NS	`dns2.uiowa.edu`
	NS	`dns3.uiowa.edu`
	NS	`dns-r1.uiowa.net`
	NS	`dns3.divms.uiowa.edu`
	PTR	`rtr-border-lc.net.uiowa.edu`

Up

20.21.255.128.in-addr.arpa

74.21.255.128.in-addr.arpa

106.21.255.128.in-addr.arpa

24.21.255.128.in-addr.arpa

21.21.255.128.in-addr.arpa

Starts with same word

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.gen.tr

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.co.za

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.pw

21.org.cn

21.net

21.la

21.ag

21.diamonds

21.cn

21.de

21.training

21.ca

Starts similarily

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.gen.tr

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.ie

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

21.co.za

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

21.pw

12.world

21.org.cn

12.by

21.net

12.org.ua

12.works

12.uz

21.la

21.ag

21.diamonds

AI analysis

21.255.128.in-addr.arpa is the parent of 20.21.255.128.in-addr.arpa, 74.21.255.128.in-addr.arpa, 106.21.255.128.in-addr.arpa, 24.21.255.128.in-addr.arpa and 21.21.255.128.in-addr.arpa.

21.255.128.in-addr.arpa is delegated to three name servers: dns1.engr.uiowa.edu, dns2.engr.uiowa.edu and dns2.icaen.uiowa.edu.

At least part of the name servers for 21.255.128.in-addr.arpa are shared with other domains, for instance iihr.uiowa.edu, cgrer.uiowa.edu, 18.255.128.in-addr.arpa, 16.255.128.in-addr.arpa and 27.255.128.in-addr.arpa.

these name servers are commonly used with dns1.icaen.uiowa.edu, dns3.engr.uiowa.edu, dns1.uiowa.edu, dns2.uiowa.edu and dns3.uiowa.edu.

Host names with two IP numbers:

dns1.engr.uiowa.edu points to: 2620:0:e50:7016::80ff:1113 and 128.255.17.19

dns2.engr.uiowa.edu points to: 2620:0:e50:7021::80ff:1514 and 128.255.21.20

Host names with one IP number:

dns2.icaen.uiowa.edu points to: 128.255.17.20

Host rtr-sc02.engr.uiowa.edu points to IP 192.168.255.254.

dbq