mcgrawhill.io - robtex.com

mcgrawhill.io

DNSSEC⚠️ Not signed
NSpdns85.ultradns.com ⭐
A2001:502:f3ff::79🇺🇸 MAINT-ID-120082001:502:f3ff::/48 Neustar
PTRpdns85.ultradns.com
A156.154.64.85🇺🇸 MAINT-ID-12008156.154.64.0/24 Neustar
PTRpdns85.ultradns.com
NSpdns85.ultradns.biz
A2610:a1:1015::79🇺🇸 MAINT-ID-120082610:a1:1015::/48 Neustar
PTRpdns85.ultradns.biz
A156.154.66.85🇺🇸 MAINT-ID-12008156.154.66.0/24 Neustar
PTRpdns85.ultradns.biz
NSpdns85.ultradns.net
A2610:a1:1014::79🇺🇸 MAINT-ID-120082610:a1:1014::/48 Neustar
PTRpdns85.ultradns.net
A156.154.65.85🇺🇸 MAINT-ID-12008156.154.65.0/24 Neustar
PTRpdns85.ultradns.net
NSpdns85.ultradns.org
A2001:502:4612::79🇺🇸 MAINT-ID-120082001:502:4612::/48 Neustar
PTRpdns85.ultradns.org
A156.154.67.85🇺🇸 MAINT-ID-12008156.154.67.0/24 Neustar
PTRpdns85.ultradns.org
TXTv=spf1 -all
SOApdns85.ultradns.comhostmaster@mheducation.com 2019-10-10 #9

io

DNSSEC🔒 Signed (DS record present)
NSa0.nic.io ⭐
NSa2.nic.io
NSb0.nic.io
NSc0.nic.io
SOAa0.nic.iohostmaster@donuts.email serial=1777674939

Same first word

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mcgrawhill.org
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mcgrawhill.us
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DNS History

4 records (4 active, 0 former)

NSpdns85.ultradns.bizpdns85.ultradns.compdns85.ultradns.netpdns85.ultradns.org
●NSpdns85.ultradns.biz2026-04-24 → 2026-05-01 · 2 obs
● 2026-04-24 05:09:20
● 2026-05-01 23:07:08
●NSpdns85.ultradns.com2026-04-24 → 2026-05-01 · 2 obs
● 2026-04-24 05:09:20
● 2026-05-01 23:07:08
●NSpdns85.ultradns.net2026-04-24 → 2026-05-01 · 2 obs
● 2026-04-24 05:09:20
● 2026-05-01 23:07:08
●NSpdns85.ultradns.org2026-04-24 → 2026-05-01 · 2 obs
● 2026-04-24 05:09:20
● 2026-05-01 23:07:08

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
ioa0.nic.io, a2.nic.io, b0.nic.io, c0.nic.io-
mcgrawhill.iopdns85.ultradns.com, pdns85.ultradns.org, pdns85.ultradns.biz, pdns85.ultradns.net-

✅ Authoritative Response

Server:156.154.66.85

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for mcgrawhill.io (unsigned zone)

⏱️ Timing

Total: 753ms | Queries: -

📄 Records

TypeCountSample Data
NS4pdns85.ultradns.biz, pdns85.ultradns.com...
TXT1v=spf1 -all
SOA1pdns85.ultradns.com hostmaster.mheducati

Analysis

Name Servers

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

mcgrawhill.io shares name servers with other domains at least partially, for instance mhconnectfrench.com, digm8.com, istudentedition.com, mhrmathmanitoba.com and istudybusstats.com.

Host names with two IP numbers:

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

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

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

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