Autonomous system
AS12887 NETIA-AS2
Unclassified RIPE
Summary
Netia (AS2)
isp telecom infrastructure
An autonomous system created in 2025 to hold one thing: carrier-grade NAT address space.
What it's used for
- A Polish operator's second autonomous system, carrying the addresses its subscribers are translated behind. 19,712 addresses across 39 IPv4 prefixes, two observed BGP neighbours, and no IPv6 announced.
Notable
- Most blocks are /22s, and most carry the netname
NETIA-CGNAT. 84.40.156.0/22is the olderPL-NETIA-20040903.- All eighteen sampled addresses returned names, every one of the form
84-40-157-0.cgnat.inetia.pl. - First observed in the routing archive in February 2025.
Interesting
- Almost every AS in this range first appears in the routing archive around 2000. This one appears in 2025, which makes it a useful contrast: new autonomous systems are rarely new companies now, they are existing operators splitting a function out into its own number.
- The function here is carrier-grade NAT, where thousands of subscribers share one public address. Naming the netname, the AS and the entire reverse zone
cgnatis unusually honest — operators often hide the arrangement, and stating it plainly helps anyone diagnosing why one address seems to be in several places at once. - Eighteen of eighteen addresses answering, all from one template, is what a purpose-built network looks like. Nothing here accumulated over decades; the whole thing was generated at once for a single job.
- An AS that exists because IPv4 ran out, announcing no IPv6 at all. Carrier NAT is the alternative to deploying the protocol that would remove the need for it, and this record is that trade-off written down.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
1 upstream, 1 downstream and 2 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS12741 | Netia SA | 2,497 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-15, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 39 prefixes · 19.71K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| PL | Poland | 39 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS12887- Registry name
- NETIA-AS2
- Registrant
- NETIA-MNT
- Abuse contact
- abuse@inetia.pl
- Registered
- 2011-03-21
- Last changed
- 2025-02-17
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 42 valid, 0 with no ROA
- ROAs
- 42 authorising AS12887
- ASPA
- no ASPA record
- IRR
- 100% registered · 42 of 42 announcements
- Route objects
- 44 naming AS12887
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,781 prefixes, as published 2026-10-16. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere