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 7,875th largest of 82,200 active autonomous systems by IPv4 space.

IPv4 addresses16,384in 11 prefixes
IPv6 prefixes1≈ 7.9 × 10²⁸ addresses
Size rank#7,875of 82,200 active ASNs
Abuser scoreLow0.52% of its addresses flagged · method

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
NetworkAddressesFirst – last address
81.173.48.0/204,09681.173.48.0 – 81.173.63.255
81.173.64.0/204,09681.173.64.0 – 81.173.79.255
109.235.32.0/212,048109.235.32.0 – 109.235.39.255
81.23.244.0/221,02481.23.244.0 – 81.23.247.255
81.173.0.0/221,02481.173.0.0 – 81.173.3.255
81.173.32.0/221,02481.173.32.0 – 81.173.35.255
81.173.96.0/221,02481.173.96.0 – 81.173.99.255
185.61.68.0/221,024185.61.68.0 – 185.61.71.255
81.173.126.0/2351281.173.126.0 – 81.173.127.255
81.173.7.0/2425681.173.7.0 – 81.173.7.255
81.173.125.0/2425681.173.125.0 – 81.173.125.255

IPv6 prefixes

1 prefix
  • 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"

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