Country
—
ASN LANDING PAGE
AS21373
NBB-AS Banque Nationale de Belgique
Last updated · Jul 20, 2026
Total prefixes
6
IPv4 prefixes
6
IPv6 prefixes
0
ASN summary
How to read the scale of AS21373
NBB-AS Banque Nationale de Belgique currently reports 6 prefixes and 2 upstream, downstream, or peer relationships. These counts describe the current dataset; they do not by themselves prove network quality, reach, or service use.
What can an ASN page answer?
An ASN page shows the public organization label, country or region, BGP prefixes, and available peer and upstream relationships. It adds network context but cannot confirm a website host, physical facility, security status, or service quality.
How should you read the organization and region fields?
NBB-AS Banque Nationale de Belgique is currently associated with an unknown region. These values come from public network sources and are useful lookup clues; an organization label, registration region, and actual service location may differ.
How should you verify the AS21373 result?
The page shows ASN data returned by the current upstream query; interpret it with the update time. Open representative IP pages from the same network and compare prefixes, source labels, and query times. Verify operator or service claims with the relevant registry or network operator.
How to verify this ASN result
AS21373 ASN lookupAS21373 BGPAS21373 peersAS21373 prefixesAS21373 upstreamsNBB-AS Banque Nationale de Belgique ASN
Upstreams
Detailed data for this ASN is not available right now.
Downstreams
Detailed data for this ASN is not available right now.
Peers
Prefix inventory
| Prefix | Name | Country |
|---|---|---|
| 193.53.48.0/24 | AS21373 | — |
| 193.53.50.0/24 | AS21373 | — |
| 193.53.54.0/24 | AS21373 | — |
| 193.53.55.0/24 | AS21373 | — |
| 193.53.56.0/23 | AS21373 | — |
| 193.53.58.0/23 | AS21373 | — |
Related ASN pages
AS15169 · Google
Review Google network organization fields, prefixes, peers, upstreams, and downstreams.
AS13335 · Cloudflare
Review Cloudflare network organization fields, prefixes, peers, upstreams, and downstreams.
AS8075 · Microsoft
Review Microsoft network organization fields, prefixes, peers, upstreams, and downstreams.
AS16509 · Amazon
Review Amazon network organization fields, prefixes, peers, upstreams, and downstreams.
Related lookups and next steps
Frequently asked questions about this ASN page
What does AS21373 represent?
AS21373 is an autonomous system number. The current source associates it with NBB-AS Banque Nationale de Belgique and the region field an unknown region; those values add network context but do not prove a specific service, physical location, or quality level.
What are peers, upstreams, and prefixes useful for on the AS21373 page?
They help explain the scale, interconnection depth, and route structure of AS21373. Richer peering and upstream data often indicate broader network reach, but they should still be interpreted together with prefixes and related IP landing pages.
What should you do after reviewing AS21373?
Open a concrete IP page to check how the address maps into AS21373, then compare the prefix, source labels, and query time. Verify operator or service claims with the relevant registry or network operator.
Related topics
BGP and ASN Basics Guide
Use real IP and ASN pages to understand ASNs, BGP prefixes, peers, upstreams, and downstreams, including the limits of each snapshot.
Routing Troubleshooting and Network Analysis
Build troubleshooting context from an IP, BGP prefix, ASN, and public network relationships without treating static route data as a packet path.
Cloud Network and ASN Comparison
Compare representative cloud and edge networks by ASN, announced prefixes, peers, upstreams, and downstreams without inferring a specific host or customer workload.