`mcgrawhill.com.pr`

DNSSEC	⚠️ Not signed
NS	`pdns85.ultradns.com` ⭐
		A	2001:502:f3ff::79^{🇺🇸 MAINT-ID-120082001:502:f3ff::/48 Neustar}
			PTR	`pdns85.ultradns.com`
		A	156.154.64.85^{🇺🇸 MAINT-ID-12008156.154.64.0/24 Neustar}
			PTR	`pdns85.ultradns.com`
NS	`pdns85.ultradns.biz`
		A	2610:a1:1015::79^{🇺🇸 MAINT-ID-120082610:a1:1015::/48 Neustar}
			PTR	`pdns85.ultradns.biz`
		A	156.154.66.85^{🇺🇸 MAINT-ID-12008156.154.66.0/24 Neustar}
			PTR	`pdns85.ultradns.biz`
NS	`pdns85.ultradns.net`
		A	2610:a1:1014::79^{🇺🇸 MAINT-ID-120082610:a1:1014::/48 Neustar}
			PTR	`pdns85.ultradns.net`
		A	156.154.65.85^{🇺🇸 MAINT-ID-12008156.154.65.0/24 Neustar}
			PTR	`pdns85.ultradns.net`
NS	`pdns85.ultradns.org`
		A	2001:502:4612::79^{🇺🇸 MAINT-ID-120082001:502:4612::/48 Neustar}
			PTR	`pdns85.ultradns.org`
		A	156.154.67.85^{🇺🇸 MAINT-ID-12008156.154.67.0/24 Neustar}
			PTR	`pdns85.ultradns.org`
TXT	`v=spf1 -all`
SOA	`pdns85.ultradns.com`hostmaster@mheducation.com 2019-10-10 #9

`com.pr`

	DNSSEC	⚠️ Not signed
	NS	`a0.pr.afilias-nst.info` ⭐ ⚠️ Not in parent delegation
	NS	`a2.pr.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`b0.pr.afilias-nst.org` ⚠️ Not in parent delegation
	NS	`b2.pr.afilias-nst.org` ⚠️ Not in parent delegation
	NS	`c0.pr.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`d0.pr.afilias-nst.org` ⚠️ Not in parent delegation
	SOA	`a0.pr.afilias-nst.info`hostmaster@donuts.email serial=1777169509

WOT: SAFE (99/100)

Same first word

DNS History

4 records (4 active, 0 former)

●NSpdns85.ultradns.biz2026-04-22 → 2026-04-26 · 2 obs

● 2026-04-22 09:49:40
● 2026-04-26 02:20:08

●NSpdns85.ultradns.com2026-04-22 → 2026-04-26 · 2 obs

● 2026-04-22 09:49:40
● 2026-04-26 02:20:08

●NSpdns85.ultradns.net2026-04-22 → 2026-04-26 · 2 obs

● 2026-04-22 09:49:40
● 2026-04-26 02:20:08

●NSpdns85.ultradns.org2026-04-22 → 2026-04-26 · 2 obs

● 2026-04-22 09:49:40
● 2026-04-26 02:20:08

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
pr	a.lactld.org, a0.pr.afilias-nst.info, a2.pr.afilias-nst.info, b0.pr.afilias-nst.org...	16 records
mcgrawhill.com.pr	pdns85.ultradns.biz, pdns85.ultradns.com, pdns85.ultradns.net, pdns85.ultradns.org	-

✅ Authoritative Response

Server:156.154.64.85

NS records: pdns85.ultradns.biz, pdns85.ultradns.com, pdns85.ultradns.net, pdns85.ultradns.org

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for mcgrawhill.com.pr (unsigned zone)

⏱️ Timing

Total: 611ms | Queries: -

📄 Records

Type	Count	Sample Data
NS	4	`pdns85.ultradns.biz, pdns85.ultradns.com...`
TXT	1	`v=spf1 -all`
SOA	1	`pdns85.ultradns.com hostmaster.mheducati`

📌 Glue Records Collected

Total: 16

Out-of-bailiwick: 16 (a.lactld.org, a.lactld.org, a0.pr.afilias-nst.info...)

Analysis

Name Servers

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

mcgrawhill.com.pr at least partially shares name servers with other domains such as digm7.com, highschoolequivalency.com, ntc-college.com, sracorrectivereading.com and istudyaccounting.com.

Host names with two IP numbers:

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

mcgrawhill.com.pr - robtex.com