asn.dev

Autonomous system

AS12511 CH-POSTNETZ Post CH AG

Unclassified RIPE

IPv4 addresses 166K 4 prefixes
IPv6 prefixes 2 counted as prefixes, not addresses
Countries 1 mostly CH
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

Swiss Post

Switzerland · AI-generated

enterprise government business

The Swiss postal service holding two /16s that are one apart, with the block between them missing.

What it's used for

  • Corporate connectivity for the national postal operator. 165,888 addresses in four IPv4 prefixes, two IPv6 prefixes, and one observed BGP neighbour.

Notable

  • The two largest blocks are 138.189.0.0/16 and 138.191.0.0/16. 138.190.0.0/16 sits between them and is not part of this inventory.
  • The rest is a /17 at 194.41.128.0 and a /21 at 84.246.232.0.
  • Three of the four share the bare netname CH-POSTNETZ; only the /21 is dated, as CH-POSTNETZ-20041101.
  • Every block is registered to Die Schweizerische Post AG, with Post CH AG handling abuse.
  • The IPv6 announcements are a /31 and a /32.

Interesting

  • Two /16s with a gap is the tell that these were assigned individually rather than as one larger allocation later divided. A single grant of that size would have been contiguous; 138.190 going elsewhere means the post office asked twice and took what was free.
  • POSTNETZ is simply the post network, and the naming is as plain as the institution. Three undated netnames alongside one dated 20041101 shows the convention arriving mid-inventory — the older records were written before the registry started stamping the application date into the name, and nobody went back to retrofit them.
  • 165,888 addresses reached through a single neighbour is a large private network, not a service provider. The address count reflects an organisation with offices in every town.

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

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

1 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS3303Swisscom (Schweiz) AG349

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-27, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 4 prefixes · 166K addresses IPv6 2 prefixes

CountryNamePrefixes
CHSwitzerland6

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS12511
Registry name
CH-POSTNETZ
Registrant
Die Schweizerische Post AG
Abuse contact
abuse@post.ch
Registered
1970-01-01
Last changed
2020-04-09
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 7 valid, 0 with no ROA
ROAs
11 authorising AS12511
ASPA
no ASPA record
IRR
100% registered · 7 of 7 announcements
Route objects
11 naming AS12511

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: 446 networks and 1,852 prefixes, as published 2026-10-27. 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

Cross-check