81.161.251.0/24

AS28949 · Technical University of Sofia

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Summary

Country	Bulgaria
Domain	tu-sofia.bg
ASN	AS28949
Parent Range	81.161.240.0/20
Registry	RIPE
ID	BG-TUSNET

WHOIS Details

inetnum:        81.161.240.0 - 81.161.255.255
netname:        BG-TUSNET
descr:          8, Kliment Ohridski St.
descr:          Sofia 1000, Bulgaria
country:        BG
sponsoring-org: ORG-MN1-RIPE
admin-c:        SP9887-RIPE
tech-c:         LP9887-RIPE
status:         ASSIGNED PI
org:            ORG-TUOS2-RIPE
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         TUSOFIA-MNT
mnt-routes:     TUSOFIA-MNT
notify:         admin@tu-sofia.bg
created:        2003-04-17T14:04:56Z
last-modified:  2025-12-23T06:42:18Z
source:         RIPE
abuse-email:    abuse@tu-sofia.bg
abuse-c:        AR19085-RIPE
abuse-org:      ORG-MN1-RIPE

organisation:   ORG-TUOS2-RIPE
org-name:       Technical University of Sofia
country:        BG
org-type:       OTHER
address:        8, Kliment Ohridski Bul.
address:        1000 Sofia
address:        Bulgaria
admin-c:        SP9887-RIPE
tech-c:         LP9887-RIPE
e-mail:         stefka@tu-sofia.bg
abuse-c:        AR19085-RIPE
e-mail:         lup@tu-sofia.bg
e-mail:         admin@tu-sofia.bg
mnt-ref:        TUSOFIA-MNT
mnt-by:         TUSOFIA-MNT
created:        2013-02-19T08:28:11Z
last-modified:  2022-12-01T16:56:36Z
source:         RIPE
abuse-email:    abuse@tu-sofia.bg
abuse-c:        AR19085-RIPE
abuse-org:      undefined

person:         Luben Popov
address:        Technical University of Sofia
address:        8, Kliment Ohridski St
address:        1000 Sofia
address:        Bulgaria
phone:          +359 2 9653981
nic-hdl:        LP9887-RIPE
mnt-by:         TUSOFIA-MNT
org:            ORG-TUOS2-RIPE
created:        2013-02-19T08:44:20Z
last-modified:  2013-02-19T08:44:20Z
source:         RIPE

person:         Stefka Popova
address:        Technical University of Sofia
address:        8, Kliment Ohridski St
address:        1000 Sofia
address:        Bulgaria
phone:          +359 2 9653041
fax-no:         +359 2 685446
mnt-by:         TUSOFIA-MNT
e-mail:         stefka@tu-sofia.bg
nic-hdl:        SP9887-RIPE
org:            ORG-TUOS2-RIPE
created:        2002-02-04T13:27:44Z
last-modified:  2013-02-19T08:39:35Z
source:         RIPE

route:          81.161.240.0/20
descr:          Technical University - Sofia
origin:         AS28949
mnt-by:         TUSOFIA-MNT
created:        2003-05-17T07:46:42Z
last-modified:  2003-05-17T07:46:42Z
source:         RIPE

Overlapping Ranges

BGP prefixes that contain 81.161.251.0/24

Range	ASN	Company	Num of IPs
81.161.240.0/20	AS28949	8, Kliment Ohridski St.	4,096

Nearby Ranges

BGP prefixes that overlap with 81.161.0.0/16

Range	ASN	Company	Num of IPs
81.161.128.0/18	AS15516	DKTV A/S	16,384
81.161.64.0/20	AS59479	GEMNET s.r.o.	4,096
81.161.208.0/20	AS9177	RTA Telecom Ltd.	4,096
81.161.192.0/20	AS58321	Oxylion Sp. z o.o.	4,096
81.161.240.0/20	AS28949	8, Kliment Ohridski St.	4,096
81.161.80.0/21	AS204170	Awaser Oman LLC	2,048
81.161.88.0/21	AS204170	Awaser Oman LLC	2,048
81.161.108.0/22	AS199980	IVENDO sp. z o.o.	1,024
81.161.52.0/22	AS2856	Welt-Net Broadband	1,024
81.161.48.0/22	AS50835	Welt-Net Broadband	1,024
81.161.104.0/22	AS44124	Rybnet Sp. z o.o. Sp. k.	1,024
81.161.4.0/22	AS3561	SoHo Internet Solutions	1,024
81.161.12.0/22	AS9009	M247 Miami Customer	1,024
81.161.116.0/22	AS59516	Lanamar, Ltd.	1,024
81.161.102.0/23	AS208861	NETOWSKI sp. z o.o.	512
81.161.56.0/23	AS198288	Sitewalk Establishment	512
81.161.96.0/23	AS198944	TNI Partner A/S	512
81.161.112.0/23	AS199028	Uniwersytet Medyczny w Lublinie	512
81.161.98.0/23	AS51115	HLL LLC	512
81.161.60.0/23	AS59477	LIFEPC, s.r.o.	512
81.161.235.0/24	AS207146	STATIC BUSINESS CUSTOMER REGION MI	256
81.161.229.0/24	AS20860	WorldStream B.V.	256
81.161.9.0/24	AS136787	PacketHub United Kingdom	256
81.161.115.0/24	AS211763	JAF International Services GmbH	256
81.161.238.0/24	AS214668	axushost.com	256
81.161.239.0/24	AS215292	GravHosting	256
81.161.237.0/24	AS20454	Fuse_Hostingweb	256
81.161.228.0/24	AS203217	Horizon Scope Mobile Telecom WLL	256
81.161.236.0/24	AS197715	Serverbike LTD	256
81.161.226.0/24	AS43131	Kay Net Customer IPv4 Space	256
81.161.231.0/24	AS197625	BMF PORT BURGAS AD	256
81.161.59.0/24	AS44418	Bitdefender SRL	256
81.161.225.0/24	AS47492	Consider IT Limited	256
81.161.224.0/24	AS47492	Consider IT Limited	256
81.161.100.0/24	AS197177	InterWan Sp. z o.o.	256
81.161.11.0/24	AS136787	PacketHub United Kingdom	256
81.161.202.0/24	AS58321	Oxylion Sp. z o.o.	256
81.161.62.0/24	AS16509	The Mobility House Energy GmbH	256
81.161.10.0/24	AS136787	PacketHub United Kingdom	256
81.161.230.0/24	AS151612	HOSTPERL	256
81.161.8.0/24	AS136787	PacketHub United Kingdom	256
81.161.114.0/24	AS59603	Regional state independent organization The information and techonological center of Kamchatka	256
81.161.101.0/24	AS61154	IDHosting Sp. z o. o.	256
81.161.58.0/24	AS204818	HOSTEUR SAS	256
81.161.63.0/24	AS205907	JSC MSU-1	256

Hosted domains

There is 1 domain name hosted across 1 IP address on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP

Hosted domains API

Our Hosted Domains API, or Reverse IP API returns a full list of domains that are hosted on a single IP address.

Useful for Cybersecurity

Read more

Pingable IPs

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

IP Address	ASN	Details
81.161.251.189	AS28949 Technical University of Sofia	`0.76ms` 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
62.206.126.8	AS20676 Plusnet GmbH	`1.29ms` from Berlin, DE
73.45.133.136	AS7922 Comcast Cable Communications, LLC	`3.98ms` from Chicago, US
98.185.151.88	AS22773 Cox Communications Inc.	`13.85ms` from Dallas, US
66.137.255.104	AS7018 AT&T Enterprises, LLC	`0.90ms` from Dallas, US
109.154.81.248	AS2856 British Telecommunications PLC	`7.37ms` from Erith, GB
68.55.214.120	AS7922 Comcast Cable Communications, LLC	`8.92ms` from Flint, US
34.185.197.136	AS396982 Google LLC	`0.11ms` from Frankfurt am Main, DE
124.197.213.168	AS9971 SK Broadband Co Ltd	`1.38ms` from Incheon, KR
90.201.108.248	AS5607 Sky UK Limited	`10.81ms` from London, GB
80.70.98.184	AS34351 MTS PJSC	`5.81ms` from Moscow, RU
74.70.228.200	AS11351 Charter Communications Inc	`17.93ms` from New York City, US
85.236.157.24	AS53589 PlanetHoster	`0.33ms` from Paris, FR
62.149.69.152	AS25019 Saudi Telecom Company JSC	`0.81ms` from Riyadh, SA
73.221.155.168	AS7922 Comcast Cable Communications, LLC	`12.22ms` from Seattle, US
73.29.127.248	AS7922 Comcast Cable Communications, LLC	`5.63ms` from Secaucus, US
222.99.117.104	AS4766 Korea Telecom	`1.47ms` from Seoul, KR
219.250.178.200	AS9318 SK Broadband Co Ltd	`7.17ms` from Seoul, KR
57.180.204.56	AS16509 Amazon.com, Inc.	`0.24ms` from Tokyo, JP
60.133.198.136	AS17676 SoftBank Corp.	`2.79ms` from Tokyo, JP
63.140.79.200	AS7782 Alaska Communications Systems Group, Inc.	`0.89ms` from Anchorage, US
79.131.214.8	AS6799 Ote SA (Hellenic Telecommunications Organisation)	`6.11ms` from Athens, GR
99.26.241.56	AS7018 AT&T Enterprises, LLC	`19.66ms` from Atlanta, US
131.203.3.200	AS9790 Two Degrees Networks Limited	`0.33ms` from Auckland, NZ
44.232.227.104	AS16509 Amazon.com, Inc.	`0.34ms` from Boardman, US
34.245.32.216	AS16509 Amazon.com, Inc.	`0.46ms` from Dublin, IE

Traceroute

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

traceroute -a -n -q1 -f4 81.161.251.129

traceroute to 81.161.251.129 (81.161.251.129): 64 hops max, 52 byte packets

4 [AS8717] 213.222.40.233 0.585 ms

5 [AS8717] 213.222.40.234 0.441 ms

6 [AS28949] 81.161.240.202 0.805 ms

7 [AS28949] 81.161.240.198 0.874 ms

8 [AS28949] 81.161.251.129 1.004 ms

Measurement taken from

IPinfo ProbeNet in Sofia, BG

On April 13th 2026

What are IP address ranges?

IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

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