Autonomous System
AS42541 Fiberby ApS
ISPActiveDenmarkRIPE
AS42541 (FIBERBY) is an ISP network operated by Fiberby ApS in Denmark, registered with RIPE. It has 5 IPv4 prefixes with 11,008 addresses and 1 IPv6 prefix, which makes it the 9,678th largest of 82,200 active autonomous systems by IPv4 space.
IPv4 addresses11,008in 5 prefixes
IPv6 prefixes1≈ 6.3 × 10²⁹ addresses
Size rank#9,678of 82,200 active ASNs
Details
OrganizationFiberby ApS
AS nameFIBERBY
Websitefiberby.dk
Country Denmark (DK)
Network typeISP
RegistryRIPE
Abuse contactabuse@fiberby.net
Registered2009-11-13
Last updated2026-04-09
IPv4 prefixes
5 prefixes · 11,008 addresses| Network | Addresses | First – last address |
|---|---|---|
| 89.23.224.0/19 | 8,192 | 89.23.224.0 – 89.23.255.255 |
| 185.10.220.0/22 | 1,024 | 185.10.220.0 – 185.10.223.255 |
| 193.106.164.0/22 | 1,024 | 193.106.164.0 – 193.106.167.255 |
| 194.62.216.0/23 | 512 | 194.62.216.0 – 194.62.217.255 |
| 193.104.135.0/24 | 256 | 193.104.135.0 – 193.104.135.255 |
89.23.224.0/19 185.10.220.0/22 193.106.164.0/22 194.62.216.0/23 193.104.135.0/24
IPv6 prefixes
1 prefix- 2a03:5440::/29
2a03:5440::/29
Query AS42541 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=AS42541&key=YOUR_API_KEY"Any address in its prefixes resolves to AS42541, with or without a key:
curl "https://api.ipapi.is/?q=89.23.224.1"