`advancedtheory.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

Subdomains

hostmaster.advancedtheory.com

Same first word

advancedtheory.com

DNS History

4 records (3 active, 1 former)

●NSns.buydomains.com2026-03-21 → 2026-03-24 · 2 obs

● 2026-03-21 22:01:06
● 2026-03-24 03:06:28

●NSthis-domain-for-sale.com2026-03-21 → 2026-03-24 · 2 obs

● 2026-03-21 22:01:06
● 2026-03-24 03:06:28

●A207.148.248.1432015-11-08 → 2026-03-24 · 3 obs

○ 2015-06-23 00:32:26
● 2015-11-08 10:17:38
● 2026-03-24 03:06:28

○A66.151.181.492015-06-23 → 2015-06-23 · 3 obs

● 2015-06-23 00:32:26
○ 2015-11-08 10:17:38
○ 2026-03-24 03:06:28

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
advancedtheory.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 advancedtheory.com (unsigned zone)

⏱️ Timing

Total: 4651ms | 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

Hierarchy

advancedtheory.com is the parent of hostmaster.advancedtheory.com.

IP Addresses

advancedtheory.com resolves to a single IP: 207.148.248.143.

Other host names, for instance newburycafe.com, modulardeck.com, richardbertrand.com, rapiddates.com and practicalstewardship.com share IP numbers with advancedtheory.com.

Name Servers

advancedtheory.com has two name servers: this-domain-for-sale.com and ns.buydomains.com.

advancedtheory.com shares the same name server setup as other domains, for example duevu.com, sakrand.com, differentlearning.com, elegantseats.com and fabulousoils.com.

Host names with one IP number:

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

ns.buydomains.com points to: 52.20.26.87

Names pointing to 52.20.26.87: this-domain-for-sale.com and ns.buydomains.com

advancedtheory.com - robtex.com