AS43153 — SFERANET-AS SferaNET Sp. z o.o.

AS43153 announces 5 IPv4 prefixes covering 3,584 addresses and 0 IPv6 prefixes.

About this network

SFERANET-AS is operated by SferaNET Sp. z o.o.

What it's used for

• The address space carries fiber-to-the-home subscriber traffic, evidenced by netnames PL-FIBRETECH and SFERANET-BB, and reverse DNS entries such as rev197-255.sferanet.pl and rev-208-128.sferanet.pl.
• The AS announces 3584 IPv4 addresses across 5 prefixes and maintains 10 observed neighbours, a ratio consistent with a regional access network rather than a transit provider.
• Traffic from this AS consists of residential and business broadband users in the Bielsko-Biała region of Poland, utilizing fiber-optic connections for internet, television, and voice services.

Notable

• Registrants for the majority of prefixes (91.192.196.0/22, 91.215.32.0/22, 193.200.82.0/23) are listed as SferaNET Sp. z o.o., while 85.219.208.0/23 is registered to T-Mobile.pl B2B and 195.136.160.0/23 to ABUSE EXATEL, indicating inherited or leased address space.
• SferaNET Sp. z o.o. was incorporated in 2023 following the merger of Fibreo S.A. and SferaNET sp. z o.o., which began operating under the unified SferaNET brand in April 2025.
• The inventory consists of five distinct IPv4 prefixes with no announced IPv6 space, reflecting a legacy IPv4-centric infrastructure.

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

Announced prefixes

• 85.219.208.0/23
• 91.192.196.0/22
• 91.215.32.0/22
• 193.200.82.0/23
• 195.136.160.0/23

Upstream networks

• AS29535 Orange Polska Spolka Akcyjna
• AS20804 Exatel S.A.
• AS12912 T-Mobile Polska S.A.
• AS9141 P4 Sp. z o.o.
• AS197064 EmiTel S.A.
• AS24482 SG.GS

Downstream networks

• AS199810 Miasto Bielsko-Biala

Adjacent networks

• AS20804 Exatel S.A.
• AS29535 Orange Polska Spolka Akcyjna
• AS9141 P4 Sp. z o.o.
• AS12912 T-Mobile Polska S.A.
• AS199810 Miasto Bielsko-Biala
• AS197064 EmiTel S.A.
• AS24482 SG.GS

Routing security

• RPKI: 3 valid, 0 invalid and 3 not-found announcements; 4 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 9 route objects.
• Listed in as-sets: AS-CPOP, AS-ENERGISPL, AS-EXATEL-INT, AS-EXATEL-PL, AS-HURRICANE, AS-I-NET-SFERA, AS-IPARTNERS, AS-SFERANET, AS197064:AS-PEER, AS197064:AS-WORLD-TRANSIT, AS29535:AS-MIX2, AS5617:AS-PL, AS8246:AS-TPNET, AS9141:AS-P4NET.