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 15
IPv4 addresses 4,096
IPv6 addresses 0
ASN type Education
Registry ripe
Allocated 23 years ago on Apr 16, 2003
Updated a month 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 15 domain names hosted across 10 IP addresses on this ASN.

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IP Address Domain Domains on this IP
81.161.248.186 ██████████ 3
81.161.240.3 ██████████ 3
81.161.241.17 ██████████ 2
81.161.251.235 ██████████ 1
81.161.250.25 ██████████ 1
81.161.246.92 ██████████ 1
81.161.244.206 ██████████ 1
81.161.245.239 ████████ 1
81.161.244.205 ██████████ 1
81.161.241.2 ██████████ 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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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
81.161.253.1 AS28949 Technical University of Sofia 1.33ms from Sofia, BG
81.161.246.223 AS28949 Technical University of Sofia 0.56ms from Sofia, BG
81.161.252.83 AS28949 Technical University of Sofia 0.57ms from Sofia, BG
81.161.249.187 AS28949 Technical University of Sofia 0.63ms from Sofia, BG
81.161.242.185 AS28949 Technical University of Sofia 0.56ms from Sofia, BG
81.161.241.109 AS28949 Technical University of Sofia 0.60ms from Sofia, BG
81.161.248.122 AS28949 Technical University of Sofia 0.57ms from Sofia, BG
81.161.240.201 AS28949 Technical University of Sofia 0.34ms from Sofia, BG
81.161.250.165 AS28949 Technical University of Sofia 0.60ms from Sofia, BG
81.161.243.20 AS28949 Technical University of Sofia 0.59ms from Sofia, BG
81.161.247.28 AS28949 Technical University of Sofia 0.60ms from Sofia, BG
81.161.245.69 AS28949 Technical University of Sofia 0.60ms from Sofia, BG
81.161.254.16 AS28949 Technical University of Sofia 0.59ms from Sofia, BG
81.161.251.226 AS28949 Technical University of Sofia 0.65ms from Sofia, BG
81.161.244.134 AS28949 Technical University of Sofia 0.54ms 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
46.145.94.229 AS1136 KPN B.V. 6.11ms from Amsterdam, NL
188.42.233.181 AS35415 Webzilla B.V. 0.32ms from Amsterdam, NL
117.156.43.53 AS9808 China Mobile Communications Group Co., Ltd. 3.84ms from Lanzhou, CN
187.202.122.53 AS8151 UNINET 1.13ms from Mexico City, MX
198.233.157.101 AS209 CenturyLink Communications, LLC 1.25ms from Minneapolis, US
50.80.215.229 AS30036 Mediacom Communications Corp 18.73ms from Minneapolis, US
90.34.83.37 AS3215 Orange S.A. 15.52ms from Paris, FR
83.204.158.229 AS3215 Orange S.A. 3.58ms from Paris, FR
67.11.56.245 AS11427 Charter Communications Inc 4.72ms from Richardson, US
45.190.243.181 AS265615 Assetel SA de CV 5.46ms from Santiago de Queretaro, MX
200.230.244.5 AS4230 CLARO S.A. 1.10ms from Sao Paulo, BR
191.233.3.37 AS8075 Microsoft Corporation 0.19ms from Sao Paulo, BR
3.35.170.21 AS16509 Amazon.com, Inc. 0.15ms from Seoul, KR
119.195.41.229 AS4766 Korea Telecom 7.23ms from Seoul, KR
103.10.1.85 AS59083 Shanghai Kuanhui Tech. Co.,ltd 3.16ms from Shanghai, CN
116.87.157.69 AS55430 Starhub Ltd 1.47ms from Singapore, SG
99.234.191.245 AS812 Rogers Communications Canada Inc. 4.32ms from Toronto, CA
73.60.234.117 AS7922 Comcast Cable Communications, LLC 7.41ms from Boston, US
177.202.52.133 AS8167 V tal 3.23ms from Brasilia, BR
32.65.32.5 AS7018 AT&T Enterprises, LLC 1.01ms from Chicago, US
96.52.110.181 AS6327 Shaw Communications 4.66ms from Edmonton, CA
35.198.157.69 AS396982 Google LLC 0.10ms from Frankfurt am Main, DE
183.48.166.197 AS4134 CHINANET-BACKBONE 4.53ms from Guangzhou, CN
122.136.139.117 AS4837 CHINA UNICOM China169 Backbone 11.51ms from Harbin, CN
114.104.119.117 AS4134 CHINANET-BACKBONE 8.34ms from Huai'an, CN

Traceroute

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

$
traceroute -a -n -q1 -f4 81.161.251.137
traceroute to 81.161.251.137 (81.161.251.137): 64 hops max, 52 byte packets
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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