AS203821 — IT4-POLSKA IT4 Polska Sp. z o.o.

AS203821 announces 2 IPv4 prefixes covering 768 addresses and 0 IPv6 prefixes.

About this network

The AS handle IT4-POLSKA is held by IT4 Polska Sp. z o.o.

What it's used for

• The address space carries residential and business connectivity, evidenced by reverse DNS entries such as ip-91-207-184-128.it4polska.com and netnames it4polska-pl and PL-ENFORMATEL-20220413.
• The network announces 768 IPv4 addresses across 2 prefixes and maintains 4 observed neighbours, a ratio consistent with a regional access provider rather than a transit hub.
• Traffic from this AS consists of subscriber eyeballs and local business endpoints served by a regional cable and DSL operator.

Notable

• Registrants include Sylwester Harasim for the it4polska-pl netname and Enformatel Sp. z o.o. for the PL-ENFORMATEL-20220413 netname, indicating a mix of direct and potentially leased or partner-managed address space.
• The address inventory is small and concentrated in two blocks, one of which is a /23 and the other a /24, typical of a niche regional ISP.

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

Announced prefixes

• 91.207.184.0/23
• 217.28.134.0/24

Upstream networks

• AS51465 M3.NET Sp. zoo

Adjacent networks

• AS51465 M3.NET Sp. zoo

Routing security

• RPKI: 0 valid, 0 invalid and 3 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 4 route objects.
• Listed in as-sets: AS-HURRICANE, AS-IT4POLSKA, AS-RETN-ACTUAL-V4, AS-TRANSROUTE-SPEC, AS51465:AS-FIXMAP, AS51465:AS-FIXMAP-ISPS, AS51465:AS-M3NET-TRANSIT, AS5617:AS-PL.

Internet exchanges

• Equinix Internet Exchange Warsaw — Warsaw, Poland