`harpercollinstest.com`

DNSSEC	⚠️ Not signed
NS	`dbru.br.ns.els-gms.att.net` ⭐
		A	2001:1890:1ff:9f0:68:94:156:134^{🇺🇸 AS70182001:1890::/29 AT&T Enterprises, LLC}
			PTR	`dbru.br.ns.els-gms.att.net`
		A	68.94.156.134^{🇺🇸 AS701868.88.0.0/13 ARIN Allocation SBC Internet Services}
			PTR	`dbru.br.ns.els-gms.att.net`
NS	`dmtu.mt.ns.els-gms.att.net`
		A	2001:1890:1ff:9f1:99:99:99:134^{🇺🇸 AS70182001:1890::/29 AT&T Enterprises, LLC}
			PTR	`dmtu.mt.ns.els-gms.att.net`
		A	99.99.99.134^{🇺🇸 AS701899.96.0.0/13 AT&T Enterprises, LLC}
			PTR	`dmtu.mt.ns.els-gms.att.net`
MX	`mxa-00596a01.gslb.pphosted.com` ⭐
		A	205.220.182.48^{🇺🇸 Proofpoint205.220.182.0/24 2020-10-08}
			PTR	`mx0b-00596a01.pphosted.com`
MX	`mxb-00596a01.gslb.pphosted.com` ⭐
		A	205.220.182.48^{🇺🇸 Proofpoint205.220.182.0/24 2020-10-08}
			PTR	`mx0b-00596a01.pphosted.com`
TXT	`v=spf1 include:spf.protection.outlook.com include:spf-00596a01.pphosted.com -all`
TXT	`MS=ms73049004`
SOA	`dbru.br.ns.els-gms.att.net`rm-hostmaster@ems.att.com serial=21

`com`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1776089892

Same first word

harpercollinstest.com

DNS History

5 records (4 active, 1 former)

●NSdbru.br.ns.els-gms.att.net2016-12-19 → 2026-04-13 · 2 obs

● 2016-12-19 18:32:10
● 2026-04-13 14:45:34

●NSdmtu.mt.ns.els-gms.att.net2016-12-19 → 2026-04-13 · 2 obs

● 2016-12-19 18:32:10
● 2026-04-13 14:45:34

○MXharpercollinstest-com.mail.protection.outlook.com2016-12-19 → 2017-10-09 · 4 obs

● 2016-12-19 18:32:10
● 2017-10-09 19:52:48
○ 2026-03-26 09:49:38
○ 2026-04-13 14:45:34

●MXmxa-00596a01.gslb.pphosted.com2026-03-26 → 2026-04-13 · 3 obs

○ 2017-10-09 19:52:48
● 2026-03-26 09:49:38
● 2026-04-13 14:45:34

●MXmxb-00596a01.gslb.pphosted.com2026-03-26 → 2026-04-13 · 3 obs

○ 2017-10-09 19:52:48
● 2026-03-26 09:49:38
● 2026-04-13 14:45:34

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	i.gtld-servers.net, g.gtld-servers.net, a.gtld-servers.net, m.gtld-servers.net...	-
harpercollinstest.com	dbru.br.ns.els-gms.att.net, dmtu.mt.ns.els-gms.att.net	-

✅ Authoritative Response

Server:68.94.156.134

NS records: dbru.br.ns.els-gms.att.net, dmtu.mt.ns.els-gms.att.net

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for harpercollinstest.com (unsigned zone)

⏱️ Timing

Total: 489ms | Queries: -

📄 Records

Type	Count	Sample Data
NS	2	`dmtu.mt.ns.els-gms.att.net, dbru.br.ns.els-gms.att.net`
MX	2	`mxa-00596a01.gslb.pphosted.com (pri: 5), mxb-00596a01.gslb.pphosted.com (pri: 5)`
TXT	2	`v=spf1 include:spf.protection.outlook.co, MS=ms73049004`
SOA	1	`dbru.br.ns.els-gms.att.net rm-hostmaster`

Analysis

Name Servers

harpercollinstest.com is delegated to two name servers dbru.br.ns.els-gms.att.net and dmtu.mt.ns.els-gms.att.net.

harpercollinstest.com shares the same name server setup as other domains, for instance 176-29.63.106.12.in-addr.arpa, ci.hutto.tx.us, 77.4.12.in-addr.arpa, duanemorris911.com and acmecatering.com.

harpercollinstest.com at least partially shares name servers with other domains, for instance 154.134.23.in-addr.arpa, veteransholidays.com, entergy-texas.com, landscapeproductsinc.com and cae18.com.

These name servers are commonly used with the following name servers: cmtu.mt.ns.els-gms.att.net, cbru.br.ns.els-gms.att.net, ns3.level3.net, ns4.level3.net, b23.ns.els-gms.att.net, m23.ns.els-gms.att.net, b24.ns.els-gms.att.net, m24.ns.els-gms.att.net, dns3.carnival.com and xbru.br.ns.els-gms.att.net.

Host names with two IP numbers:

The host name dbru.br.ns.els-gms.att.net points to 2001:1890:1ff:9f0:68:94:156:134 and 68.94.156.134; the host name dmtu.mt.ns.els-gms.att.net points to 2001:1890:1ff:9f1:99:99:99:134 and 99.99.99.134.

Mail Servers

Two mail servers handle harpercollinstest.com: mxa-00596a01.gslb.pphosted.com and mxb-00596a01.gslb.pphosted.com.

harpercollinstest.com shares the same mail server setup as other domains, for instance dowjones.com, newsinteractive.com.au, wentworthcourier.com.au, avail.co and the-sun.ie.

harpercollinstest.com shares some mail servers with other domains, at least partially, for instance sunday-times.com, weeklytrader.com.au, creerlahistoria.com, deardeidre.com and parramattaadvertiser.com.au.

Host names with a single IP:

mxa-00596a01.gslb.pphosted.com points to 205.220.182.48.

mxb-00596a01.gslb.pphosted.com points to 205.220.182.48.

Host names pointing to 205.220.182.48: mxa-00596a01.gslb.pphosted.com and mxb-00596a01.gslb.pphosted.com.

harpercollinstest.com - robtex.com