`certainknowledge.com`

DNSSEC	⚠️ Not signed
A	207.148.248.143^{🇺🇸 EIG-29873207.148.248.0/24}
		PTR	`ip-207-148-248-143.defastlink.net`
NS	`ns.buydomains.com` ⚠️ Not in zone NS records
		A	52.20.26.87^{🇺🇸 Amazon52.20.0.0/14 EC2 IAD prefix}
			PTR	`ec2-52-20-26-87.compute-1.amazonaws.com`
NS	`this-domain-for-sale.com` ⚠️ Not in zone NS records
		A	52.20.26.87^{🇺🇸 Amazon52.20.0.0/14 EC2 IAD prefix}
			PTR	`ec2-52-20-26-87.compute-1.amazonaws.com`

`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=1771291435

Same first word

certainknowledge.co.uk

certainknowledge.com

DNS History

14 records (3 active, 11 former)

●NSns.buydomains.com2026-03-23 → 2026-03-24 · 3 obs

○ 2017-04-02 11:47:52
● 2026-03-23 10:49:16
● 2026-03-24 09:33:18

○NSns1.tpgi.com.au2016-02-27 → 2017-04-02 · 5 obs

○ 2015-11-13 12:41:30
● 2016-02-27 12:55:24
● 2017-04-02 11:47:52
○ 2026-03-23 10:49:16
○ 2026-03-24 09:33:18

○NSns2.tpgi.com.au2016-02-27 → 2017-04-02 · 5 obs

○ 2015-11-13 12:41:30
● 2016-02-27 12:55:24
● 2017-04-02 11:47:52
○ 2026-03-23 10:49:16
○ 2026-03-24 09:33:18

○NSpridns.pacific.net.au2015-08-10 → 2015-11-13 · 5 obs

○ 2008-03-19 20:13:42
● 2015-08-10 07:21:30
● 2015-11-13 12:41:30
○ 2016-02-27 12:55:24
○ 2026-03-24 09:33:18

○NSsecdns.pacific.net.au2015-08-10 → 2015-11-13 · 5 obs

○ 2008-03-19 20:13:42
● 2015-08-10 07:21:30
● 2015-11-13 12:41:30
○ 2016-02-27 12:55:24
○ 2026-03-24 09:33:18

●NSthis-domain-for-sale.com2026-03-23 → 2026-03-24 · 3 obs

○ 2017-04-02 11:47:52
● 2026-03-23 10:49:16
● 2026-03-24 09:33:18

○MXmailin1.pacific.net.au2015-08-10 → 2015-11-13 · 5 obs

○ 2008-03-19 20:13:42
● 2015-08-10 07:21:30
● 2015-11-13 12:41:30
○ 2016-02-27 12:55:24
○ 2026-03-24 09:33:18

○MXmailin2.pacific.net.au2015-08-10 → 2015-11-13 · 5 obs

○ 2008-03-19 20:13:42
● 2015-08-10 07:21:30
● 2015-11-13 12:41:30
○ 2016-02-27 12:55:24
○ 2026-03-24 09:33:18

○MXmx1.tpgi.com.au2016-02-27 → 2017-04-02 · 5 obs

○ 2015-11-13 12:41:30
● 2016-02-27 12:55:24
● 2017-04-02 11:47:52
○ 2026-03-23 10:49:16
○ 2026-03-24 09:33:18

○MXmx2.tpgi.com.au2016-02-27 → 2017-04-02 · 5 obs

○ 2015-11-13 12:41:30
● 2016-02-27 12:55:24
● 2017-04-02 11:47:52
○ 2026-03-23 10:49:16
○ 2026-03-24 09:33:18

○A203.26.24.1442016-07-13 → 2017-04-02 · 5 obs

○ 2016-02-27 12:55:24
● 2016-07-13 18:37:00
● 2017-04-02 11:47:52
○ 2026-03-23 10:49:16
○ 2026-03-24 09:33:18

○A203.26.24.822016-02-27 → 2016-02-27 · 4 obs

○ 2015-11-13 12:41:30
● 2016-02-27 12:55:24
○ 2016-07-13 18:37:00
○ 2026-03-24 09:33:18

●A207.148.248.1432026-03-23 → 2026-03-24 · 3 obs

○ 2017-04-02 11:47:52
● 2026-03-23 10:49:16
● 2026-03-24 09:33:18

○A61.8.0.572015-08-10 → 2015-11-13 · 5 obs

○ 2008-03-19 20:13:42
● 2015-08-10 07:21:30
● 2015-11-13 12:41:30
○ 2016-02-27 12:55:24
○ 2026-03-24 09:33:18

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	l.gtld-servers.net, j.gtld-servers.net, e.gtld-servers.net, h.gtld-servers.net...	-
certainknowledge.com	ns.buydomains.com, this-domain-for-sale.com	2 records

✅ Authoritative Response

Server:52.4.207.204

NS records: ns.buydomains.com, this-domain-for-sale.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for certainknowledge.com (unsigned zone)

⏱️ Timing

Total: 1570ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`207.148.248.143`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns.buydomains.com, this-domain-for-sale.com)

Analysis

IP Addresses

certainknowledge.com points to an IP address: 207.148.248.143.

other host names include aibc.net, sevinum.com, volunet.com, dreamweddingphotography.com and www.addictive.net; they share IP numbers with certainknowledge.com.

Name Servers

Two name servers this-domain-for-sale.com and ns.buydomains.com handle the delegation for certainknowledge.com.

certainknowledge.com shares the same name server setup as other domains, for instance solspeed.com, vondis.com, ugari.com, bicy.org and surfingalliance.com.

certainknowledge.com at least partially shares name servers with other domains, such as diversetrends.com, trimdeck.com and intricatemodels.com.

These name servers are commonly used alongside ns2.buydomains.com.

Host names with a single IP

this-domain-for-sale.com points to 52.20.26.87

ns.buydomains.com points to 52.20.26.87

Host names that point to 52.20.26.87: this-domain-for-sale.com and ns.buydomains.com

certainknowledge.com - robtex.com