`mcgraw-hill4learning.org`

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 mx -all`
SOA	`pdns85.ultradns.com`hostmaster@mheducation.com 2007-10-19 #19

`org`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a0.org.afilias-nst.info` ⭐ ⚠️ Not in parent delegation
	NS	`a2.org.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`b0.org.afilias-nst.org`
	NS	`b2.org.afilias-nst.org`
	NS	`c0.org.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`d0.org.afilias-nst.org`
	SOA	`a0.org.afilias-nst.info`hostmaster@donuts.email serial=1777356258

Same first word

mcgraw-hill4learning.org

mcgraw-hill4learning.com

mcgraw-hill4learning.net

DNS History

6 records (4 active, 2 former)

●NSpdns85.ultradns.biz2015-05-23 → 2026-04-28 · 2 obs

● 2015-05-23 08:16:26
● 2026-04-28 06:34:34

●NSpdns85.ultradns.com2015-05-23 → 2026-04-28 · 2 obs

● 2015-05-23 08:16:26
● 2026-04-28 06:34:34

●NSpdns85.ultradns.net2015-05-23 → 2026-04-28 · 2 obs

● 2015-05-23 08:16:26
● 2026-04-28 06:34:34

●NSpdns85.ultradns.org2015-05-23 → 2026-04-28 · 2 obs

● 2015-05-23 08:16:26
● 2026-04-28 06:34:34

○MXmail.eppg.com2015-05-23 → 2020-02-27 · 4 obs

● 2015-05-23 08:16:26
● 2020-02-27 03:40:40
○ 2026-04-23 19:50:58
○ 2026-04-28 06:34:34

○A12.26.55.1822015-05-23 → 2020-02-27 · 4 obs

● 2015-05-23 08:16:26
● 2020-02-27 03:40:40
○ 2026-04-23 19:50:58
○ 2026-04-28 06:34:34

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
org	b2.org.afilias-nst.org, d0.org.afilias-nst.org, b0.org.afilias-nst.org	-
mcgraw-hill4learning.org	pdns85.ultradns.biz, pdns85.ultradns.com, pdns85.ultradns.net, pdns85.ultradns.org	2 records

✅ Authoritative Response

Server:156.154.66.85

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for mcgraw-hill4learning.org (unsigned zone)

⏱️ Timing

Total: 233ms | Queries: -

📄 Records

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

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (pdns85.ultradns.org, pdns85.ultradns.org)

Analysis

Name Servers

mcgraw-hill4learning.org's delegation is handled by four name servers: pdns85.ultradns.biz, pdns85.ultradns.com, pdns85.ultradns.net and pdns85.ultradns.org.

mcgraw-hill4learning.org partially shares name servers with other domains; examples include wgconnect.com, cardonbcom.com, mathscape2.com, myebook.ca and kensaladin.com.

These name servers are often used with the name servers udns1.ultradns.net and udns2.ultradns.net.

Host names with two IPs:

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

mcgraw-hill4learning.org - robtex.com