doubletree.co - dns.ninja

`doubletree.co`

DNSSEC	⚠️ Not signed
A	167.187.200.18^{🇺🇸 AS26529167.187.200.0/22 AC_HILTONWORL}
		PTR	`ftcrdf-nonsecure.hilton.com`
		PTR	`richardsondallas.hilton.com`
		PTR	`uksupply.hilton.com`
NS	`ns1.markmonitor.com` ⭐
		A	2620:10a:80a8::1^{🇨🇦 CIRA-22620:10a:80a8::/48 markmonitor v6 cloud1 979 Bank Street, Suite 400 Ottawa ON K1S 5K5 Canada}
		A	149.112.160.1^{🇨🇦 CIRA-2149.112.160.0/24 markmonitor v4 cloud1 979 Bank Street, Suite 400 Ottawa ON K1S 5K5 Canada}
NS	`ns2.markmonitor.com`
		A	2001:67c:10b8::1^{🇨🇭 RCODEZERO-ANYCAST-SEC22001:67c:10b8::/48 IPCOM-anycast-net}
			PTR	`ns2.markmonitor.com`
		A	176.97.158.1^{🇦🇹 RCODEZERO-ANYCAST-SEC2176.97.158.0/24 NICat-anycast-net}
			PTR	`ns2.markmonitor.com`
NS	`ns3.markmonitor.com`
		A	2620:10a:80a9::1^{🇨🇦 CIRA-32620:10a:80a9::/48 markmonitor v6 cloud2 979 Bank Street, Suite 400 Ottawa ON K1S 5K5 Canada}
		A	149.112.161.1^{🇨🇦 CIRA-3149.112.161.0/24 markmonitor v4 cloud2 979 Bank Street, Suite 400 Ottawa ON K1S 5K5 Canada}
NS	`ns4.markmonitor.com`
		A	2001:67c:1bc::1^{🇦🇹 RCODEZERO-ANYCAST-SEC1-TLD2001:67c:1bc::/48 IPCom-NET Anycast}
			PTR	`ns1.markmonitor.com`
		A	192.174.68.1^{🇦🇹 RCODEZERO-ANYCAST-SEC1-TLD192.174.68.0/24 NICat-anycast-net}
			PTR	`ns1.markmonitor.com`
NS	`ns5.markmonitor.com` ⚠️ Not in parent delegation
		A	2620:10a:80a8::2^{🇨🇦 CIRA-22620:10a:80a8::/48 markmonitor v6 cloud1 979 Bank Street, Suite 400 Ottawa ON K1S 5K5 Canada}
		A	149.112.160.2^{🇨🇦 CIRA-2149.112.160.0/24 markmonitor v4 cloud1 979 Bank Street, Suite 400 Ottawa ON K1S 5K5 Canada}
NS	`ns6.markmonitor.com` ⚠️ Not in parent delegation
		A	2001:67c:10b8::3^{🇨🇭 RCODEZERO-ANYCAST-SEC22001:67c:10b8::/48 IPCOM-anycast-net}
			PTR	`ns6.markmonitor.com`
		A	176.97.158.3^{🇦🇹 RCODEZERO-ANYCAST-SEC2176.97.158.0/24 NICat-anycast-net}
			PTR	`ns6.markmonitor.com`
NS	`ns7.markmonitor.com` ⚠️ Not in parent delegation
		A	2620:10a:80a9::2^{🇨🇦 CIRA-32620:10a:80a9::/48 markmonitor v6 cloud2 979 Bank Street, Suite 400 Ottawa ON K1S 5K5 Canada}
		A	149.112.161.2^{🇨🇦 CIRA-3149.112.161.0/24 markmonitor v4 cloud2 979 Bank Street, Suite 400 Ottawa ON K1S 5K5 Canada}
SOA	`ns1.markmonitor.com`hostmaster@markmonitor.com 2024-01-25 #1

`co`

	DNSSEC	🔒 Signed (DS record present)
	NS	`ns0.centralnic.net` ⭐
	NS	`a.registrydns.co`
	NS	`b.registrydns.co`
	NS	`c.registrydns.co`
	NS	`d.registrydns.co`
	SOA	`ns0.centralnic.net`hostmaster@centralnic.net serial=1759728247

Same first word

DNS History

15 records (8 active, 7 former)

●NSns1.markmonitor.com2026-07-27 → 2026-08-08 · 3 obs

○ 2017-04-19 22:53:28
● 2026-07-27 12:45:28
● 2026-08-08 21:36:28

○NSns1.netnames.net2015-08-15 → 2017-04-19 · 4 obs

● 2015-08-15 00:33:18
● 2017-04-19 22:53:28
○ 2026-07-27 12:45:28
○ 2026-08-08 21:36:28

●NSns2.markmonitor.com2026-07-27 → 2026-08-08 · 3 obs

○ 2017-04-19 22:53:28
● 2026-07-27 12:45:28
● 2026-08-08 21:36:28

○NSns2.netnames.net2015-08-15 → 2017-04-19 · 4 obs

● 2015-08-15 00:33:18
● 2017-04-19 22:53:28
○ 2026-07-27 12:45:28
○ 2026-08-08 21:36:28

●NSns3.markmonitor.com2026-07-27 → 2026-08-08 · 3 obs

○ 2017-04-19 22:53:28
● 2026-07-27 12:45:28
● 2026-08-08 21:36:28

●NSns4.markmonitor.com2026-07-27 → 2026-08-08 · 3 obs

○ 2017-04-19 22:53:28
● 2026-07-27 12:45:28
● 2026-08-08 21:36:28

●NSns5.markmonitor.com2026-07-27 → 2026-08-08 · 3 obs

○ 2017-04-19 22:53:28
● 2026-07-27 12:45:28
● 2026-08-08 21:36:28

○NSns5.netnames.net2015-08-15 → 2017-04-19 · 4 obs

● 2015-08-15 00:33:18
● 2017-04-19 22:53:28
○ 2026-07-27 12:45:28
○ 2026-08-08 21:36:28

●NSns6.markmonitor.com2026-07-27 → 2026-08-08 · 3 obs

○ 2017-04-19 22:53:28
● 2026-07-27 12:45:28
● 2026-08-08 21:36:28

○NSns6.netnames.net2015-08-15 → 2017-04-19 · 4 obs

● 2015-08-15 00:33:18
● 2017-04-19 22:53:28
○ 2026-07-27 12:45:28
○ 2026-08-08 21:36:28

●NSns7.markmonitor.com2026-07-27 → 2026-08-08 · 3 obs

○ 2017-04-19 22:53:28
● 2026-07-27 12:45:28
● 2026-08-08 21:36:28

○MXrelay1.netnames.net2015-08-15 → 2017-04-19 · 4 obs

● 2015-08-15 00:33:18
● 2017-04-19 22:53:28
○ 2026-07-27 12:45:28
○ 2026-08-08 21:36:28

○MXrelay2.netnames.net2015-08-15 → 2017-04-19 · 4 obs

● 2015-08-15 00:33:18
● 2017-04-19 22:53:28
○ 2026-07-27 12:45:28
○ 2026-08-08 21:36:28

●A167.187.200.182026-07-27 → 2026-08-08 · 3 obs

○ 2017-04-19 22:53:28
● 2026-07-27 12:45:28
● 2026-08-08 21:36:28

○A185.26.230.1292015-08-15 → 2017-04-19 · 4 obs

● 2015-08-15 00:33:18
● 2017-04-19 22:53:28
○ 2026-07-27 12:45:28
○ 2026-08-08 21:36:28

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
co	a.registrydns.co, b.registrydns.co, c.registrydns.co, d.registrydns.co	-
doubletree.co	ns1.markmonitor.com, ns2.markmonitor.com, ns3.markmonitor.com, ns4.markmonitor.com	-

✅ Authoritative Response

Server:149.112.161.1

NS records: ns1.markmonitor.com, ns2.markmonitor.com, ns3.markmonitor.com, ns4.markmonitor.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for doubletree.co (unsigned zone)

⏱️ Timing

Total: 1277ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`167.187.200.18`
NS	7	`ns1.markmonitor.com, ns2.markmonitor.com...`
SOA	1	`ns1.markmonitor.com hostmaster.markmonit`

Analysis

IP Addresses

doubletree.co directs to one IP number, which is 167.187.200.18.

Among the host names that share IP numbers with doubletree.co are hamptoninncheckin.com, h2bringit.com, hometwohotel.co.uk and two others.

Name Servers

doubletree.co carries NS records listing 7 name servers — ns1.markmonitor.com, ns2.markmonitor.com, ns3.markmonitor.com and 4 others.

doubletree.co has at least partial name server overlap with other domains, such as primex.com, could.us, calvinklein.mobi and two others.

It is common to find these name servers paired with the name servers ns4.markmonitor.com, ns5.markmonitor.com, ns6.markmonitor.com and ns7.markmonitor.com.

Hosts with two IP numbers each:

The A records for ns1.markmonitor.com return 149.112.160.1 and 2620:10a:80a8::1.

The A records for ns2.markmonitor.com return 176.97.158.1 and 2001:67c:10b8::1.

The A records for ns3.markmonitor.com return 149.112.161.1 and 2620:10a:80a9::1.

The A records for ns4.markmonitor.com return 192.174.68.1 and 2001:67c:1bc::1.

The A records for ns5.markmonitor.com return 149.112.160.2 and 2620:10a:80a8::2.

The A records for ns6.markmonitor.com return 176.97.158.3 and 2001:67c:10b8::3.

The A records for ns7.markmonitor.com return 149.112.161.2 and 2620:10a:80a9::2.