Autonomous System
AS50522 Sewan Nederland B.V.
ISPActiveNetherlandsRIPE
AS50522 (SEWAN-NL) is an ISP network operated by Sewan Nederland B.V. in Netherlands, registered with RIPE. It has 11 IPv4 prefixes with 16,384 addresses and 1 IPv6 prefix, which makes it the 7,877th largest of 82,558 active autonomous systems by IPv4 space.
IPv4 addresses16,384in 11 prefixes
IPv6 prefixes1≈ 7.9 × 10²⁸ addresses
Size rank#7,877of 82,558 active ASNs
Details
OrganizationSewan Nederland B.V.
AS nameSEWAN-NL
Websitesewan.nl
Country Netherlands (NL)
Network typeISP
RegistryRIPE
Abuse contactabuse@sewan.nl
Registered2010-02-02
Last updated2026-05-11
IPv4 prefixes
11 prefixes · 16,384 addresses| Network | Addresses | First – last address |
|---|---|---|
| 81.173.48.0/20 | 4,096 | 81.173.48.0 – 81.173.63.255 |
| 81.173.64.0/20 | 4,096 | 81.173.64.0 – 81.173.79.255 |
| 109.235.32.0/21 | 2,048 | 109.235.32.0 – 109.235.39.255 |
| 81.23.244.0/22 | 1,024 | 81.23.244.0 – 81.23.247.255 |
| 81.173.0.0/22 | 1,024 | 81.173.0.0 – 81.173.3.255 |
| 81.173.32.0/22 | 1,024 | 81.173.32.0 – 81.173.35.255 |
| 81.173.96.0/22 | 1,024 | 81.173.96.0 – 81.173.99.255 |
| 185.61.68.0/22 | 1,024 | 185.61.68.0 – 185.61.71.255 |
| 81.173.126.0/23 | 512 | 81.173.126.0 – 81.173.127.255 |
| 81.173.7.0/24 | 256 | 81.173.7.0 – 81.173.7.255 |
| 81.173.125.0/24 | 256 | 81.173.125.0 – 81.173.125.255 |
81.173.48.0/20 81.173.64.0/20 109.235.32.0/21 81.23.244.0/22 81.173.0.0/22 81.173.32.0/22 81.173.96.0/22 185.61.68.0/22 81.173.126.0/23 81.173.7.0/24 81.173.125.0/24
IPv6 prefixes
1 prefix- 2a03:be00::/32
2a03:be00::/32
Query AS50522 with the API
The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day.
curl "https://api.ipapi.is/?q=AS50522&key=YOUR_API_KEY"Any address in its prefixes resolves to AS50522, with or without a key:
curl "https://api.ipapi.is/?q=81.173.48.1"