WWW.RTSAK.COM - 21.255.128.in-addr.arpa

Search for IP or hostnames:

21.255.128.in-addr.arpa checked at 2025-10-02T18:22:17.045Z 889ms 90/90/90 100% R:39

`21.255.128.in-addr.arpa`

NS	`dns1.uiowa.edu`
		A	2620:0:e50:3::10 ^{🇺🇸 University of Iowa}
			PTR	`dns-e1.uiowa.edu`
		A	128.255.1.26^{🇺🇸 University of Iowa}
			PTR	`dns-e1.uiowa.edu`
NS	`dns2.uiowa.edu`
		A	2620:0:e50:3::11 ^{🇺🇸 University of Iowa}
			PTR	`dns-e2.uiowa.edu`
		A	128.255.64.26^{🇺🇸 University of Iowa}
			PTR	`dns-e2.uiowa.edu`
NS	`dns3.uiowa.edu`
		A	2620:0:e50:3::12 ^{🇺🇸 University of Iowa}
			PTR	`dns-e3.uiowa.edu`
		A	128.255.1.27^{🇺🇸 University of Iowa}
			PTR	`dns-e3.uiowa.edu`
NS	`dns2.engr.uiowa.edu`
		A	2620:0:e50:7021::80ff:1514 ^{🇺🇸 University of Iowa}
		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	`dns1.icaen.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.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`
	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

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

21.cn

AI analysis

21.255.128.in-addr.arpa is 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 six name servers: dns1.uiowa.edu, dns2.uiowa.edu, dns3.uiowa.edu, dns2.engr.uiowa.edu, dns1.icaen.uiowa.edu and dns2.icaen.uiowa.edu.

21.255.128.in-addr.arpa at least partially shares name servers with other domains, including iihr.uiowa.edu, uiowa.net, 6.255.128.in-addr.arpa, mednmr.uiowa.edu and 102.255.128.in-addr.arpa.

These name servers are commonly used with dns-core-cb-1.uiowa.edu, dns-core-coph-1.uiowa.edu, dns-core-itf-1.uiowa.edu, dns-core-itf-2.uiowa.edu, dns-core-lc-0.uiowa.edu, dns-core-lc-1.uiowa.edu, dns-wireless-cb-1.uiowa.edu, dns-wireless-coph-1.uiowa.edu, dns-wireless-lc-1.uiowa.edu and dns-r1.uiowa.net.

Two IPs per host:

dns1.uiowa.edu points to: 2620:0:e50:3::10 and 128.255.1.26.

dns2.uiowa.edu points to: 2620:0:e50:3::11 and 128.255.64.26.

dns3.uiowa.edu points to: 2620:0:e50:3::12 and 128.255.1.27.

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

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

One IP per host:

dns2.icaen.uiowa.edu points to: 128.255.17.20.

Host name rtr-sc02.engr.uiowa.edu resolves to a single IP: 192.168.255.254.

dbq