Autonomous System
AS33820 RELX GROUP PLC
BusinessActiveUnited KingdomRIPE
AS33820 (REED-ELSEVIER-AS) is a business network operated by RELX GROUP PLC in United Kingdom, registered with RIPE. It has 19 IPv4 prefixes with 16,384 addresses, which makes it the 7,836th largest of 82,200 active autonomous systems by IPv4 space.
IPv4 addresses16,384in 19 prefixes
IPv6 prefixes0none
Size rank#7,836of 82,200 active ASNs
Details
OrganizationRELX GROUP PLC
AS nameREED-ELSEVIER-AS
Websiteelsevier.com
Country United Kingdom (GB)
Network typeBusiness
RegistryRIPE
Abuse contactnet-admin@elsevier.com
Registered2004-08-10
Last updated2026-03-18
IPv4 prefixes
19 prefixes · 16,384 addresses| Network | Addresses | First – last address |
|---|---|---|
| 145.36.0.0/20 | 4,096 | 145.36.0.0 – 145.36.15.255 |
| 145.36.16.0/20 | 4,096 | 145.36.16.0 – 145.36.31.255 |
| 145.36.32.0/20 | 4,096 | 145.36.32.0 – 145.36.47.255 |
| 145.36.48.0/24 | 256 | 145.36.48.0 – 145.36.48.255 |
| 145.36.49.0/24 | 256 | 145.36.49.0 – 145.36.49.255 |
| 145.36.50.0/24 | 256 | 145.36.50.0 – 145.36.50.255 |
| 145.36.51.0/24 | 256 | 145.36.51.0 – 145.36.51.255 |
| 145.36.52.0/24 | 256 | 145.36.52.0 – 145.36.52.255 |
| 145.36.53.0/24 | 256 | 145.36.53.0 – 145.36.53.255 |
| 145.36.54.0/24 | 256 | 145.36.54.0 – 145.36.54.255 |
| 145.36.55.0/24 | 256 | 145.36.55.0 – 145.36.55.255 |
| 145.36.56.0/24 | 256 | 145.36.56.0 – 145.36.56.255 |
| 145.36.57.0/24 | 256 | 145.36.57.0 – 145.36.57.255 |
| 145.36.58.0/24 | 256 | 145.36.58.0 – 145.36.58.255 |
| 145.36.59.0/24 | 256 | 145.36.59.0 – 145.36.59.255 |
| 198.176.121.0/24 | 256 | 198.176.121.0 – 198.176.121.255 |
| 198.176.123.0/24 | 256 | 198.176.123.0 – 198.176.123.255 |
| 198.176.124.0/24 | 256 | 198.176.124.0 – 198.176.124.255 |
| 198.176.126.0/24 | 256 | 198.176.126.0 – 198.176.126.255 |
145.36.0.0/20 145.36.16.0/20 145.36.32.0/20 145.36.48.0/24 145.36.49.0/24 145.36.50.0/24 145.36.51.0/24 145.36.52.0/24 145.36.53.0/24 145.36.54.0/24 145.36.55.0/24 145.36.56.0/24 145.36.57.0/24 145.36.58.0/24 145.36.59.0/24 198.176.121.0/24 198.176.123.0/24 198.176.124.0/24 198.176.126.0/24
IPv6 prefixes
No IPv6 prefixes.
Query AS33820 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=AS33820&key=YOUR_API_KEY"Any address in its prefixes resolves to AS33820, with or without a key:
curl "https://api.ipapi.is/?q=145.36.0.1"