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 2 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
81.161.248.186 ██████████ 3
81.161.241.234 █████████ 3
81.161.240.3 ██████████ 3
81.161.241.17 ██████████ 2
81.161.244.206 ██████████ 1
81.161.250.25 ██████████ 1
81.161.241.2 ██████████ 1
81.161.244.205 ██████████ 1
81.161.246.92 ██████████ 1
81.161.245.239 ████████ 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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ASN API & Database

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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ASN API & Database

Pingable IPs

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

IP Address ASN Details
81.161.246.164 AS28949 Technical University of Sofia 0.56ms from Sofia, BG
81.161.244.31 AS28949 Technical University of Sofia 0.54ms from Sofia, BG
81.161.254.16 AS28949 Technical University of Sofia 0.52ms from Sofia, BG
81.161.252.90 AS28949 Technical University of Sofia 0.61ms from Sofia, BG
81.161.253.127 AS28949 Technical University of Sofia 0.88ms from Sofia, BG
81.161.241.46 AS28949 Technical University of Sofia 0.55ms from Sofia, BG
81.161.243.49 AS28949 Technical University of Sofia 0.57ms from Sofia, BG
81.161.248.68 AS28949 Technical University of Sofia 0.56ms from Sofia, BG
81.161.245.199 AS28949 Technical University of Sofia 0.63ms from Sofia, BG
81.161.249.187 AS28949 Technical University of Sofia 0.61ms from Sofia, BG
81.161.247.12 AS28949 Technical University of Sofia 0.60ms from Sofia, BG
81.161.242.71 AS28949 Technical University of Sofia 0.58ms from Sofia, BG
81.161.251.4 AS28949 Technical University of Sofia 0.64ms from Sofia, BG
81.161.240.201 AS28949 Technical University of Sofia 0.33ms from Sofia, BG
81.161.250.148 AS28949 Technical University of Sofia 0.61ms 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
43.154.102.5 AS132203 Tencent Building, Kejizhongyi Avenue 0.42ms from Hong Kong, HK
108.223.176.37 AS7018 AT&T Enterprises, LLC 3.08ms from Houston, US
122.174.59.229 AS24560 Bharti Airtel Ltd., Telemedia Services 1.85ms from Hyderabad, IN
147.160.9.133 AS18615 Mainstream Fiber Networks, LLC 2.16ms from Indianapolis, US
38.6.123.37 AS398823 PEG TECH INC 0.29ms from Los Angeles, US
195.85.44.5 AS199245 PricewaterhouseCoopers Societe cooperative 1.35ms from Luxembourg, LU
34.43.177.245 AS396982 Google LLC 0.07ms from Melbourne, AU
38.108.104.229 AS174 Cogent Communications, LLC 1.19ms from New York City, US
52.172.84.21 AS8075 Microsoft Corporation 0.31ms from Saint Thomas Mount, IN
1.169.180.69 AS3462 Data Communication Business Group 1.55ms from Taipei, TW
82.80.56.21 AS8551 Bezeq International Ltd. 3.61ms from Tel Aviv, IL
34.215.52.53 AS16509 Amazon.com, Inc. 0.17ms from Boardman, US
20.162.147.165 AS8075 Microsoft Corporation 0.22ms from London, GB
94.86.252.37 AS3269 Telecom Italia S.p.A. 5.01ms from Milan, IT
138.186.91.149 AS14709 Cable Onda 0.76ms from Panama, PA
128.32.149.5 AS25 University of California at Berkeley 2.73ms from San Jose, US
121.135.111.37 AS4766 Korea Telecom 1.60ms from Seoul, KR
175.124.155.5 AS9318 SK Broadband Co Ltd 0.93ms from Seoul, KR
117.135.106.181 AS24400 Shanghai Mobile Communications Co.,Ltd. 3.11ms from Shanghai, CN
220.240.128.21 AS7545 TPG Telecom Limited 1.03ms from Sydney, AU
118.20.104.117 AS4713 NTT DOCOMO BUSINESS,Inc. 4.31ms from Tokyo, JP
210.191.219.149 AS7682 HOKKAIDO TELECOMMUNICATIONS NETWORK Co., Inc. 18.24ms from Tokyo, JP
45.78.165.181 AS7992 Cogeco Connexion Inc. 10.40ms from Toronto, CA
81.28.154.21 AS397766 Fairleigh Dickinson University 0.43ms from Vancouver, CA
89.73.127.85 AS9141 P4 Sp. z o.o. 9.72ms from Warsaw, PL

Traceroute

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

$
traceroute -a -n -q1 -f4 81.161.251.27
traceroute to 81.161.251.27 (81.161.251.27): 64 hops max, 52 byte packets
6 *
Measurement taken from IPinfo ProbeNet in Sofia, BG
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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