subnet.im

AS12912T-Mobile Polska S.A.

PolandRegistryRIPE NCCTypeEyeball

As of 27th September 2026, AS12912 (T-Mobile Polska S.A.), an access network registered in Poland with RIPE NCC, originates 48 IPv4 prefixes covering 1.4M addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 381st-largest of the 79,525 networks we see originating IPv4, and the 3rd-largest of 2,096 in Poland. It is seen behind 34 upstream networks, most often AS1299 (Arelion (fka. Telia Carrier)) and AS33891 (Core-Backbone GmbH), and in front of 210 downstream networks. 84% 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

48

IPv6 prefixes

2

IPv4 addresses

1.4M

IPv6 /64s

38.7B

Upstream graph

The networks AS12912 is seen behind, one and two hops out, drawn from real AS paths.

AS12912Toward the internet core
Upstream graph for AS12912: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS12912T-Mobile Polska S…This networkAS1299Arelion (fka. Tel…AS3320Deutsche Telekom …AS6939Hurricane Electri…AS7713PT Telkom Indones…AS33891Core-Backbone GmbHAS8888xTom Pty LtdAS13030Init7 (Switzerlan…AS37271Workonline Commun…AS6453TATA Communicatio…AS35280F5 Networks SARLAS6667Elisa OyjAS24940Hetzner Online Gm…

Networks observed one and two hops upstream of AS12912 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

600

adjacent networks

Upstreams
346%
Peers
35659%
Downstreams
21035%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS12912
NetworkCountryRelationshipPathsVantage pts
AS1299Arelion (fka. Telia Carrier)SEPeer6,04691
AS33891Core-Backbone GmbHDEPeer5,80455
AS3320Deutsche Telekom AGDEPeer4,096122
AS7713PT Telkom Indonesia TbkIDPeer8273
AS6939Hurricane Electric LLCUSPeer65430
AS38880Micron21 Datacentre Pty LtdAUPeer5172
AS35280F5 Networks SARLFRPeer3562
AS7768Nuh Ahmet Firat trading as TEKNET YAZILIM VE BILGISAYAR TEKNOLOJILERITRPeer3442
AS8888xTom Pty LtdAUPeer3442
AS8298IPng Networks GmbHCHPeer3282

Prefixes

All 50

The largest blocks AS12912 originates, widest first.

Largest prefixes originated by AS12912
PrefixAddressesVisibility
178.180.0.0/14262k81/81
37.30.0.0/15131k81/81
46.204.0.0/15131k81/81
188.146.0.0/15131k81/81
89.174.0.0/1665.5k81/81
94.42.0.0/1665.5k81/81
157.25.0.0/1665.5k81/81
217.153.0.0/1665.5k81/81
37.30.0.0/1732.8k81/81
37.31.0.0/1732.8k81/81

Routing health

How AS12912'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

  • Valid84.0%42
  • Invalid0.0%0
  • No ROA16.0%8

Propagation

  • Globally propagated90% of full-feed peers or more100.0%50
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 48 prefixes

IPv6 — 2 prefixes

  • /2934.4B × /6450.0%1
  • /324.3B × /6450.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.