Autonomous System details

AS28949

Technical University of Sofia  ·  tu-sofia.bg

Bulgaria

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AS28949 – Technical University of Sofia

Field Value
Country Bulgaria
Website tu-sofia.bg
Hosted domains 20
IPv4 addresses 4,096
IPv6 addresses 0
ASN type Education
Registry ripe
Allocated 23 years ago on Apr 16, 2003
Updated 4 months ago on Dec 23, 2025

IP Ranges

Netblock Company Num of IPs
81.161.240.0/20 8, Kliment Ohridski St. 4,096
81.161.240.0/24 8, Kliment Ohridski St. 256
81.161.241.0/24 8, Kliment Ohridski St. 256
81.161.242.0/24 8, Kliment Ohridski St. 256
81.161.243.0/24 8, Kliment Ohridski St. 256
81.161.244.0/24 8, Kliment Ohridski St. 256
81.161.245.0/24 8, Kliment Ohridski St. 256
81.161.246.0/24 8, Kliment Ohridski St. 256
81.161.247.0/24 8, Kliment Ohridski St. 256
81.161.248.0/24 8, Kliment Ohridski St. 256
81.161.249.0/24 8, Kliment Ohridski St. 256
81.161.250.0/24 8, Kliment Ohridski St. 256
81.161.251.0/24 8, Kliment Ohridski St. 256
81.161.252.0/24 8, Kliment Ohridski St. 256
81.161.253.0/24 8, Kliment Ohridski St. 256
81.161.254.0/24 8, Kliment Ohridski St. 256
81.161.255.0/24 8, Kliment Ohridski St. 256

There are no known IPv6 addresses belonging to this network

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WHOIS Details

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                                                ASHandle:       AS28949
                                                OrgID:          AS28949
                                                ASName:         AS28949
                                                ASNumber:       AS28949
                                                RegDate:        0000-00-00
                                                Updated:        0000-00-00
                                                TechHandle:     AA00-AAAA
                                                Source:         AAAA
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Hosted Domains

There are 20 domain names hosted across 11 IP addresses on this ASN.

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IP Address Domain Domains on this IP
81.161.241.234 ██████████ 10
81.161.241.17 ██████████ 2
81.161.240.3 ██████████ 2
81.161.246.92 ██████████ 1
81.161.241.2 ██████████ 1
81.161.245.239 ████████ 1
81.161.248.186 ██████████ 1
81.161.250.25 ██████████ 1

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Peers

There are 2 peers for this ASN.

Peers Name
AS6802 Bulgarian Research and Education Network Association (BREN)
AS8717 A1 Bulgaria EAD
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Upstreams

There are 2 upstreams for this ASN.

upstreams Name
AS6802 Bulgarian Research and Education Network Association (BREN)
AS8717 A1 Bulgaria EAD
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Downstreams

There are no downstreams for this ASN.

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Pingable IPs

15 IPs in this ASN replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
81.161.249.12 AS28949 Technical University of Sofia 0.71ms from Sofia, BG
81.161.240.201 AS28949 Technical University of Sofia 0.43ms from Sofia, BG
81.161.251.189 AS28949 Technical University of Sofia 0.76ms from Sofia, BG
81.161.245.199 AS28949 Technical University of Sofia 0.67ms from Sofia, BG
81.161.243.49 AS28949 Technical University of Sofia 0.70ms from Sofia, BG
81.161.253.61 AS28949 Technical University of Sofia 1.32ms from Sofia, BG
81.161.247.175 AS28949 Technical University of Sofia 0.70ms from Sofia, BG
81.161.244.134 AS28949 Technical University of Sofia 0.67ms from Sofia, BG
81.161.254.253 AS28949 Technical University of Sofia 0.70ms from Sofia, BG
81.161.242.94 AS28949 Technical University of Sofia 0.66ms from Sofia, BG
81.161.252.84 AS28949 Technical University of Sofia 0.68ms from Sofia, BG
81.161.250.4 AS28949 Technical University of Sofia 0.70ms from Sofia, BG
81.161.241.85 AS28949 Technical University of Sofia 0.66ms from Sofia, BG
81.161.246.164 AS28949 Technical University of Sofia 0.65ms from Sofia, BG
81.161.248.68 AS28949 Technical University of Sofia 0.66ms from Sofia, BG

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address ASN Details
52.255.164.53 AS8075 Microsoft Corporation 0.42ms from Ashburn, US
34.217.48.5 AS16509 Amazon.com, Inc. 0.58ms from Boardman, US
47.243.174.5 AS45102 Alibaba (US) Technology Co., Ltd. 0.74ms from Hong Kong, HK
73.179.239.53 AS7922 Comcast Cable Communications, LLC 5.34ms from Miami, US
34.75.71.229 AS396982 Google LLC 0.13ms from Moncks Corner, US
113.13.45.53 AS4134 CHINANET BACKBONE 5.43ms from Nanning, CN
187.86.208.213 AS53070 T-Systems do Brasil Ltda. 2.34ms from Osasco, BR
178.67.131.53 AS12389 PJSC Rostelecom 1.23ms from Saint Petersburg, RU
188.242.244.165 AS35807 SkyNet Ltd. 0.82ms from Saint Petersburg, RU
183.109.175.197 AS4766 Korea Telecom 4.40ms from Seoul, KR
183.157.114.85 AS4134 CHINANET BACKBONE 7.84ms from Shanghai, CN
89.25.32.133 AS49737 Jobs.bg Ltd 0.79ms from Sofia, BG
89.120.48.117 AS9050 Orange Romania S.A. 0.75ms from Timisoara, RO
217.198.27.37 AS34141 in2ip B.V. 1.36ms from Amsterdam, NL
54.200.203.117 AS16509 Amazon.com, Inc. 0.34ms from Boardman, US
5.12.103.69 AS8708 DIGI ROMANIA S.A. 0.51ms from Bucharest, RO
200.17.201.181 AS10881 FUNPAR - Fundacao da UFPR para o DCTC 0.47ms from Curitiba, BR
91.12.179.37 AS3320 Deutsche Telekom AG 7.97ms from Frankfurt am Main, DE
12.171.61.85 AS7018 AT&T Enterprises, LLC 1.28ms from Kansas City, US
75.233.147.229 AS6167 Verizon Business 18.02ms from Los Angeles, US
90.34.83.37 AS3215 Orange S.A. 15.18ms from Paris, FR
221.215.210.213 AS4837 CHINA UNICOM China169 Backbone 0.55ms from Qingdao, CN
34.193.215.117 AS14618 Amazon.com, Inc. 0.22ms from Reston, US
58.126.128.117 AS9318 SK Broadband Co Ltd 7.21ms from Seoul, KR
116.235.120.213 AS4812 China Telecom (Group) 4.13ms from Shanghai, CN

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this ASN. Learn more.

$
traceroute -a -n -q1 -f3 81.161.246.63
traceroute to 81.161.246.63 (81.161.246.63): 64 hops max, 52 byte packets
4 *
5 *
6 [AS8717] 213.222.40.225 223.821 ms
7 [AS8717] 213.222.40.226 209.688 ms
8 *
9 *
10 *
11 [AS28949] 81.161.246.63 208.388 ms
Measurement taken from IPinfo ProbeNet in Ebene, MU
On

Related Networks

What is an ASN?

Autonomous System Numbers (ASNs) are assigned to entities such as Internet Service Providers and other large organizations that control blocks of IP addresses. This network page, and the organization field that's shown on the main IP address information page and also returned in the geolocation API are based on the ASN.

The ASN details will often correspond to the IP address owner, but for smaller organizations it may be that organization's parent, or their ISP. Find out more about AS28949 at robtex.

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