AS51155 — TBTELECOM Citylink Telecom Sp. z o.o.

AS51155 announces 2 IPv4 prefixes covering 5,120 addresses and 1 IPv6 prefixes.

About this network

TBTELECOM is operated by Citylink Telecom Sp. z o.o.

What it's used for

• The address space carries residential and business internet access, evidenced by the netnames PL-TBTELECOM-20100520 and Telemedian-TB associated with the announced prefixes.
• The AS announces 5120 IPv4 addresses across 2 prefixes and 1 IPv6 prefix, while maintaining 27 observed neighbours; this ratio of moderate address space to a significant number of peering partners indicates a regional access provider rather than a transit hub.
• Traffic from this network consists of subscriber eyeballs for cable and DSL services, consistent with the operator's classification as a Cable/DSL/ISP in Gdansk.

Notable

• Registrants align with the announcer, with Citylink Telecom Sp. z o.o. holding the larger block and Telemedian Sp. z o.o. holding the smaller block, suggesting a corporate relationship or acquisition history between the two entities.
• The inventory consists of two distinct IPv4 blocks and one IPv6 /32, reflecting a standard regional ISP footprint without unusual fragmentation.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 46.227.36.0/22
• 178.19.176.0/20
• 2a02:26e8::/32

Upstream networks

• AS3356 Level 3 Parent, LLC
• AS6939 Hurricane Electric LLC
• AS9002 RETN Limited
• AS24482 SG.GS
• AS8218 Zayo Infrastructure France SA
• AS34927 iFog GmbH
• AS50629 LWLcom GmbH
• AS6206 Netrouting B.V.
• AS201054 Stowarzyszenie e-Poludnie
• AS29632 Netassist International EOOD

Downstream networks

• AS41865 BIALL-NET Sp. z o.o.
• AS206651 Telemedian Sp. z o.o.
• AS56408 Gdansk Airport Sp. z o.o.
• AS51976 JP-Telekom Sp z o.o.

Adjacent networks

• AS3356 Level 3 Parent, LLC
• AS41865 BIALL-NET Sp. z o.o.
• AS206651 Telemedian Sp. z o.o.
• AS6939 Hurricane Electric LLC
• AS24482 SG.GS
• AS8218 Zayo Infrastructure France SA
• AS50629 LWLcom GmbH
• AS34927 iFog GmbH
• AS6206 Netrouting B.V.
• AS56408 Gdansk Airport Sp. z o.o.
• AS9002 RETN Limited
• AS201054 Stowarzyszenie e-Poludnie
• AS51976 JP-Telekom Sp z o.o.
• AS29632 Netassist International EOOD

Routing security

• RPKI: 4 valid, 0 invalid and 0 not-found announcements; 5 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 7 route objects.
• Listed in as-sets: AS-51155_CUSTOMERS, AS-GIX-GDANSK, AS-HURRICANEV6, AS-JARSAT, AS-PLIX-CONNECTED, AS-PLIXDC-MIX, AS-PLIXDC-TRANSIT, AS-RETN-ACTUAL-V6, AS-TBTELECOM, AS-TBTELECOM-COGENT, AS-TBTELECOM-EPIX-OPENPEERING, AS-TBTELECOM-EPIX-POLMIX, AS-TBTELECOM-EQUINIX, AS-TBTELECOM-LEVEL3, AS-VECTRA, AS12831:AS-TASK-COM-PCWS, AS12831:AS-TASK-COM-PIONIER-TP, AS51155:AS-CITYLINK-1-IX, AS51155:AS-CITYLINK-GNM, AS51155:AS-CITYLINK-GOOGLE, AS51155:AS-CITYLINK-IQ, AS51155:AS-CITYLINK-RETN, AS5550:AS-TASK, AS5550:AS-TASK-1014, AS5617:AS-PL.

Internet exchanges

• Equinix Internet Exchange Warsaw — Warsaw, Poland
• POMIX — Gdansk, Poland