`developer.tu-sofia.bg`

DNSSEC	⚠️ Not signed
A	81.161.240.20^{🇧🇬 TUSNET-AS81.161.240.0/24 Technical University - Sofia}
		PTR	`developer.tu-sofia.bg`

`tu-sofia.bg`

	DNSSEC	⚠️ Not signed
	A	81.161.240.3^{🇧🇬 TUSNET-AS81.161.240.0/24 Technical University - Sofia}
	NS	`ns.tu-sofia.bg` ⭐
	NS	`enterprise.tu-sofia.bg`
	NS	`ns.spnet.net`
	NS	`purgatory.spnet.net`
	MX	`mgate2.tu-sofia.bg` ⭐
	MX	`mgate.tu-sofia.bg`⁽⁷⁾
	MX	`mx17.mtel.net`⁽³⁰⁾
	TXT	`google-site-verification=7pvgmnPvB9czgfDUY63RVlXyjI4MMtcGEIxj4XbmNvY`
	TXT	`v=spf1 ip4:81.161.240.0/20 include:spf.protection.outlook.com include:_spf.go...`
	TXT	`Technical University of Sofia,Bulgaria`
	TXT	`google-site-verification=TAPj22QKdGTNxI_YM4_bhimfoH3dqoZrmJNRwTNHGEQ`
	SOA	`ns.tu-sofia.bg`postmaster@ns.tu-sofia.bg 2026-07-09 #6

WOT: SAFE (81/100)
rank #94064 globally
rank #49 in the tld

tu-sofia.bg

tu-sofia.bgis the official website of the Technical University of Sofia, a major Bulgarian higher‑education institution.

Key facts

Owner / operator: Technical University of Sofia
TLD:.bg— Bulgaria ccTLD
Primary purpose: university website
Status: active

WOT: SAFE (91/100)
📈 Tranco rank: #153,878

PTR for

20.240.161.81.in-addr.arpa

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DNS History

1 record (1 active, 0 former)

●A81.161.240.202026-03-19 → 2026-07-15 · 2 obs

● 2026-03-19 12:08:16
● 2026-07-15 17:31:32

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
bg	a.nic.bg, b.nic.bg, c.nic.bg, d.nic.bg...	12 records
tu-sofia.bg	ns.tu-sofia.bg, ns.spnet.net, enterprise.tu-sofia.bg, purgatory.spnet.net	2 records

✅ Authoritative Response

Server:81.161.240.11

NS records: ns.tu-sofia.bg, ns.spnet.net, enterprise.tu-sofia.bg, purgatory.spnet.net

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for tu-sofia.bg (unsigned zone)

⏱️ Timing

Total: 620ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`81.161.240.20`

📌 Glue Records Collected

Total: 14

In-bailiwick: 14 (a.nic.bg, a.nic.bg, b.nic.bg...)

Analysis

IP Addresses

developer.tu-sofia.bg points to a single IP number: 81.161.240.20.

developer.tu-sofia.bg - dns.ninja