WWW.RTSAK.COM - ctb.us

Search for IP or hostnames:

ctb.us checked at 2025-11-13T12:32:06.950Z 169ms 71/71/71 100% R:12 allDone:true timedOut:false

`ctb.us`

NS	`pdns85.ultradns.biz`
		A	2610:a1:1015::79 ^{🇺🇸 Neustar}
			PTR	`pdns85.ultradns.biz`
		A	156.154.66.85^{🇺🇸 Neustar}
			PTR	`pdns85.ultradns.biz`
NS	`pdns85.ultradns.com`
		A	2001:502:f3ff::79 ^{🇺🇸 Neustar}
			PTR	`pdns85.ultradns.com`
		A	156.154.64.85^{🇺🇸 Neustar}
			PTR	`pdns85.ultradns.com`
NS	`pdns85.ultradns.net`
		A	2610:a1:1014::79 ^{🇺🇸 Neustar}
			PTR	`pdns85.ultradns.net`
		A	156.154.65.85^{🇺🇸 Neustar}
			PTR	`pdns85.ultradns.net`
NS	`pdns85.ultradns.org`
		A	2001:502:4612::79 ^{🇺🇸 Neustar}
			PTR	`pdns85.ultradns.org`
		A	156.154.67.85^{🇺🇸 Neustar}
			PTR	`pdns85.ultradns.org`
A	192.243.92.248

`us`

	NS	`b.cctld.us`
	NS	`f.cctld.us`
	NS	`k.cctld.us`
	NS	`m.cctld.us`
	NS	`n.cctld.us`
	NS	`w.cctld.us`
	NS	`x.cctld.us`
	NS	`y.cctld.us`

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AI analysis

ctb.us resolves to a single IP: 192.243.92.248.

Other host names, for instance sra-survey.com, mhelearning.com, cinchart.com, mcgraw-hill.education and mhe.biz share IP numbers with ctb.us.

ctb.us is delegated to four name servers: pdns85.ultradns.biz, pdns85.ultradns.com, pdns85.ultradns.net and pdns85.ultradns.org.

ctb.us shares some name servers with other domains, for example srablog.com, accessmhtelecom.com, phlacuity.com, alloyacorp.net and successinhighered.com.

Host names with two IP numbers

Two IPs per host:

pdns85.ultradns.biz points to 2610:a1:1015::79 and 156.154.66.85

pdns85.ultradns.com points to 2001:502:f3ff::79 and 156.154.64.85

pdns85.ultradns.net points to 2610:a1:1014::79 and 156.154.65.85

pdns85.ultradns.org points to 2001:502:4612::79 and 156.154.67.85

dbq