asn.dev

Autonomous system

AS21373 NBB-AS

Unclassified RIPE

IPv4 addresses 2.05K 4 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly BE
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

Banque Nationale de Belgique

Belgium · AI-generated

business finance corporate

NBB-AS is operated by Banque Nationale de Belgique.

What it's used for

  • The address space carries internal corporate infrastructure, evidenced by the consistent netname NBB across all prefixes.
  • The AS announces 2048 IPv4 addresses across 4 prefixes with only 2 observed neighbours, indicating a small, self-contained corporate estate rather than a transit or access provider.

Notable

  • All registrants align with the announcer, listing NbbNetAdmin and Banque Nationale de Belgique for every prefix.
  • The inventory consists of four contiguous IPv4 blocks within the 193.53.48.0/22 range, reflecting a finely subdivided internal network structure.

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

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

ASNetworkPaths seen
AS5488Proximus NV321
AS8220COLT Technology Services Group Limited33

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-10, 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 · 2.05K addresses IPv6 0 prefixes

CountryNamePrefixes
BEBelgium4

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS21373
Registry name
NBB-AS
Registrant
Banque Nationale de Belgique
Abuse contact
info@nbb.be
Registered
2003-01-17
Last changed
2017-09-08
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 6 valid, 0 with no ROA
ROAs
14 authorising AS21373
ASPA
no ASPA record
IRR
100% registered · 6 of 6 announcements
Route objects
31 naming AS21373

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: 431 networks and 1,775 prefixes, as published 2026-10-11. 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