Autonomous System

AS209554 ISIF OU

HostingActiveEstoniaRIPE

AS209554 (ISIF-AS) is a hosting network operated by ISIF OU in Estonia, registered with RIPE. It has 26 IPv4 prefixes with 13,056 addresses and 36 IPv6 prefixes, which makes it the 8,893rd largest of 82,558 active autonomous systems by IPv4 space.

IPv4 addresses13,056in 26 prefixes
IPv6 prefixes36≈ 6.8 × 10²⁶ addresses
Size rank#8,893of 82,558 active ASNs
Abuser scoreElevated1.39% of its addresses flagged · method

Details

OrganizationISIF OU
AS nameISIF-AS
Websiteisif.net
Country Estonia (EE)
Network typeHosting
RegistryRIPE
Abuse contactabuse@isif.net
Registered2022-12-27
Last updated2025-12-09

IPv4 prefixes

26 prefixes · 13,056 addresses
NetworkAddressesFirst – last address
152.175.4.0/221,024152.175.4.0 – 152.175.7.255
152.175.8.0/221,024152.175.8.0 – 152.175.11.255
152.175.12.0/221,024152.175.12.0 – 152.175.15.255
152.175.16.0/221,024152.175.16.0 – 152.175.19.255
152.175.20.0/221,024152.175.20.0 – 152.175.23.255
82.163.64.0/2351282.163.64.0 – 82.163.65.255
82.163.66.0/2351282.163.66.0 – 82.163.67.255
82.163.168.0/2351282.163.168.0 – 82.163.169.255
82.163.170.0/2351282.163.170.0 – 82.163.171.255
82.163.224.0/2351282.163.224.0 – 82.163.225.255
82.163.226.0/2351282.163.226.0 – 82.163.227.255
152.175.4.0/23512152.175.4.0 – 152.175.5.255
152.175.6.0/23512152.175.6.0 – 152.175.7.255
152.175.8.0/23512152.175.8.0 – 152.175.9.255
152.175.10.0/23512152.175.10.0 – 152.175.11.255
45.95.212.0/2425645.95.212.0 – 45.95.212.255
152.175.1.0/24256152.175.1.0 – 152.175.1.255
152.175.2.0/24256152.175.2.0 – 152.175.2.255
152.175.12.0/24256152.175.12.0 – 152.175.12.255
152.175.13.0/24256152.175.13.0 – 152.175.13.255
152.175.14.0/24256152.175.14.0 – 152.175.14.255
152.175.33.0/24256152.175.33.0 – 152.175.33.255
152.175.34.0/24256152.175.34.0 – 152.175.34.255
152.175.65.0/24256152.175.65.0 – 152.175.65.255
152.175.66.0/24256152.175.66.0 – 152.175.66.255
The 25 largest of 26. The API and the database have all of them.

IPv6 prefixes

36 prefixes
  • 2405:84c0:6f00::/40
  • 2a0a:6040:ad00::/40
  • 2405:84c0:8028::/45
  • 2405:84c0:8014::/46
  • 2405:84c0:8054::/46
  • 2405:84c0:8008::/47
  • 2405:84c0:8012::/47
  • 2405:84c0:8022::/47
  • 2405:84c0:8024::/47
  • 2405:84c0:8026::/47
  • 2001:df1:4580::/48
  • 2405:84c0:8001::/48
  • 2405:84c0:8003::/48
  • 2405:84c0:8004::/48
  • 2405:84c0:8005::/48
  • 2405:84c0:8006::/48
  • 2405:84c0:8007::/48
  • 2405:84c0:8011::/48
  • 2405:84c0:8018::/48
  • 2405:84c0:801a::/48
  • 2405:84c0:801b::/48
  • 2405:84c0:801c::/48
  • 2405:84c0:801d::/48
  • 2405:84c0:8030::/48
  • 2405:84c0:8031::/48
The 25 largest of 36. The API and the database have all of them.

Query AS209554 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=AS209554&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS209554, with or without a key:

curl "https://api.ipapi.is/?q=152.175.4.1"

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