AS12831Technical University of Gdansk, Academic Computer Center TASK
PolandRegistryRIPE NCCTypeEyeballAs of 11th November 2026, AS12831 (Technical University of Gdansk…), an access network registered in Poland with RIPE NCC, originates 12 IPv4 prefixes covering 29.2k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 5,848th-largest of the 80,743 networks we see originating IPv4, and the 65th-largest of 2,109 in Poland. It is seen behind 3 upstream networks, most often AS196844 (Institute of Bioorganic Chemistry…) and AS13293 (Institute of Bioorganic Chemistry…), and in front of 24 downstream networks. 69% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.
At a glance
IPv4 prefixes
IPv6 prefixes
IPv4 addresses
IPv6 /64s
Upstream graph
The networks AS12831 is seen behind, one and two hops out, drawn from real AS paths.
Networks observed one and two hops upstream of AS12831 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.
Neighbouring networks
58
adjacent networks
- Upstreams
- 35%
- Peers
- 3153%
- Downstreams
- 2441%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS196844Institute of Bioorganic Chemistry Polish Academy of Science, Poznan Supercomputing and Networking Center | PL | Peer | 1,181 | 65 |
| AS13293Institute of Bioorganic Chemistry Polish Academy of Science, Poznan Supercomputing and Networking Center | PL | Peer | 908 | 73 |
| AS5550Technical University of Gdansk, Academic Computer Center TASK | PL | Peer | 33 | 33 |
Prefixes
The largest blocks AS12831 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 89.191.160.0/20 | 4.1k | 75/76 |
| 89.191.176.0/20 | 4.1k | 75/76 |
| 213.192.64.0/20 | 4.1k | 75/76 |
| 213.192.80.0/20 | 4.1k | 75/76 |
| 213.192.96.0/20 | 4.1k | 75/76 |
| 213.192.112.0/20 | 4.1k | 75/76 |
| 178.217.248.0/21 | 2k | 75/76 |
| 91.244.248.0/22 | 1k | 75/76 |
| 91.194.106.0/23 | 512 | 75/76 |
| 91.221.26.0/23 | 512 | 75/76 |
Routing health
How AS12831's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.
RPKI origin validation
- Valid69.2%9
- Invalid0.0%0
- No ROA30.8%4
Propagation
- Globally propagated90% of full-feed peers or more100.0%13
- Partially propagated40% to 90%0.0%0
- Seen by few peersUnder 40%0.0%0
Prefix sizes
IPv4 — 12 prefixes
IPv6 — 1 prefixes
- /332.1B × /64100.0%1
Recent changes
Announcements that started or stopped since 12th Oct 2026.
No announcement by AS12831 started or stopped in this period.
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.