Data as of Nov 8, 2026
81.161.248.0/21
14 residential-proxy exits · 30 daysTechnical University of Sofia
Residential-proxy exits
Proxy exits
14
0.68% of its addresses · 30 days
Always-on exits
1
7.1% of its exits
Spread
5 of 8
/24s with at least one exit
Providers
35
selling exits here
Oct 9, 2026 – Nov 7, 2026
Exits seen per day
3.7K observations
/24s with the most always-on exits
| /24 | Always-on exits | Proxy exits | |
|---|---|---|---|
| 81.161.254.0/24 | 1 | 3 | |
| 81.161.248.0/24 | 0 | 4 | |
| 81.161.249.0/24 | 0 | 4 | |
| 81.161.250.0/24 | 0 | 2 | |
| 81.161.251.0/24 | 0 | 1 |
Proxy providers listing exits
- BestProxy
- BirdProxies
- BottingTools
- ByteProxies
- Byteful
- CliProxy
- EnigmaProxy
- FastProxy
- FlashProxy
- FlexyProxies
- GSocks
- Geonix
- GonzoProxy
- IPFly
- IPPeak
- Infatica
- LemonBright
- MangoProxy
- NSocks
- NodeProxy
- NovaProxy
- Oxylabs
- Proxiware
- Proxy-Seller
- ProxyEmpire
- Proxying
- Proxyma
- PuraRoute
- RainProxy
- Shifter
- Smartproxy
- Thordata
- VantageProxies
- VitalExclusive
- ZENPROXY_PREMIUM
Announcements
Nesting
More-specifics by size
Sized by addresses, colored by each announcement's type. Click a tile with children to zoom in, a leaf to open it.
More specific
Announcements inside
| Prefix | Origin | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|
| 81.161.248.0/24 since Aug 2016 | AS28949 | Business | 4 | Technical University of Sofia | |
| 81.161.249.0/24 since Aug 2016 | AS28949 | Business | 4 | Technical University of Sofia | |
| 81.161.250.0/24 since Aug 2016 | AS28949 | Business | 2 | Technical University of Sofia | |
| 81.161.251.0/24 since Aug 2016 | AS28949 | Business | 1 | Technical University of Sofia | |
| 81.161.252.0/24 since Aug 2016 | AS28949 | Business | Technical University of Sofia | ||
| 81.161.253.0/24 since Aug 2016 | AS28949 | Business | Technical University of Sofia | ||
| 81.161.254.0/24 since Aug 2016 | AS28949 | Business | 3 1 always on | Technical University of Sofia | |
| 81.161.255.0/24 since Jun 2025 | AS28949 | Business | Technical University of Sofia |
Network & registry
Announced by
Covering announcement 81.161.240.0/20
- Prefix
- 81.161.240.0/20
- Announced by
- AS28949 Technical University of Sofia
- Type
- Business
- Proxy exits
- 40
- Always-on exits
- 1
- RPKI
- RPKI valid
- Netname
- BG-TUSNET
- Registrant
- Technical University of Sofia
- RIR
- RIPE NCC
Origin network
AS28949
BG
- Name
- Technical University of Sofia
- Type
- Education
- Registered
- Apr 16, 2003
- Domain
- tu-sofia.bg
- Industry
- Colleges, Universities, and Professional Schools
- Spamhaus ASN-DROP
- not listed
Routing timeline
Who has announced 81.161.240.0/20
81.161.240.0/20
Routing history
- Pattern
- Stable
- First seen
- May 2005
- Current origin since
- May 2025 · 1.5 yr
- Origin networks
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 81.161.240.0/20 | AS28949 | /20 | RIPE | RPKI valid |
IRR
Route objects on 81.161.240.0/20
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS28949 | RIPE | Technical University - Sofia | TUSOFIA-MNT | May 17, 2003 |
Whois
Registration for this announcement
- Range
- 81.
161. 240. 0/ 20 - Netname
- BG-TUSNET
- Registrant
- Technical University of Sofia
- Registrant country
- BG
- Organization
- Technical University of Sofia (ORG-TUOS2-RIPE)
- Org country
- BG
- Type
- ASSIGNED PI
- Created
- Apr 17, 2003
- Updated
- Dec 23, 2025
- Maintainer
- RIPE-NCC-END-MNT
- RIR
- RIPE NCC
- Country
- BG
- Delegated
- Apr 17, 2003
- Status
- assigned
Report abuse
Abuse contact
- abuse@
tu-sofia. bg - Name
- Abuse-C Role
- Handle
- AR19085-RIPE