| Prefix | Company | Number of IPs |
|---|---|---|
| 134.75.0.0/16 | KISTI | 65,536 |
| 134.75.20.0/24 | KISTI | 256 |
| 134.75.52.0/23 | KISTI | 512 |
| 134.75.250.0/24 | KISTI | 256 |
| 147.47.120.0/21 | Seoul National University | 2,048 |
| 147.47.124.0/24 | Seoul National University | 256 |
| 147.47.125.0/24 | Seoul National University | 256 |
| 150.183.0.0/16 | KISTI | 65,536 |
| 150.183.11.0/24 | KISTI | 256 |
| 202.30.40.0/22 | KISTI | 1,024 |
| 202.30.60.0/22 | KISTI | 1,024 |
| 202.31.182.0/24 | Korea Educational Development Institute | 256 |
| 203.230.0.0/24 | KISTI | 256 |
| 203.230.2.0/24 | KISTI | 256 |
| 203.230.3.0/24 | KISTI | 256 |
| 203.230.6.0/24 | KISTI | 256 |
| 203.230.7.0/24 | KISTI | 256 |
| 203.230.8.0/22 | KISTI | 1,024 |
| 203.230.16.0/23 | KISTI | 512 |
| 203.230.22.0/23 | KISTI | 512 |
| 203.230.24.0/21 | KISTI | 2,048 |
| 203.230.60.0/22 | KISTI | 1,024 |
| 203.230.64.0/21 | KISTI | 2,048 |
| 203.230.72.0/24 | KISTI | 256 |
| 203.230.73.0/24 | KISTI | 256 |
| 203.230.74.0/23 | KISTI | 512 |
| 203.230.76.0/22 | KISTI | 1,024 |
| 203.230.108.0/22 | KISTI | 1,024 |
| 203.230.116.0/23 | KISTI | 512 |
| 203.230.116.0/24 | KISTI | 256 |
| 203.230.120.0/24 | KISTI | 256 |
| 203.230.126.0/24 | KISTI | 256 |
| 203.233.155.0/24 | KISTI | 256 |
| 203.233.156.0/24 | KISTI | 256 |
| 203.241.40.0/21 | KISTI | 2,048 |
| 203.241.116.0/23 | KISTI | 512 |
| 203.241.118.0/24 | KISTI | 256 |
| 203.241.120.0/22 | KISTI | 1,024 |
| 203.241.164.0/24 | KISTI | 256 |
| 203.241.165.0/24 | KISTI | 256 |
| 203.241.169.0/24 | KISTI | 256 |
| 203.241.170.0/23 | KISTI | 512 |
| 203.241.172.0/23 | KISTI | 512 |
| 203.241.174.0/24 | KISTI | 256 |
| 203.247.64.0/24 | KISTI | 256 |
| 203.247.69.0/24 | KISTI | 256 |
| 203.247.73.0/24 | KISTI | 256 |
| 203.247.160.0/22 | Tongmyong University | 1,024 |
| 203.247.164.0/23 | KISTI | 512 |
| 203.247.167.0/24 | KISTI | 256 |
| 203.247.170.0/23 | KISTI | 512 |
| 203.247.172.0/22 | KISTI | 1,024 |
| 203.247.176.0/22 | KISTI | 1,024 |
| 203.247.180.0/23 | KISTI | 512 |
| 203.247.184.0/24 | Korea Electrotechnology Research Institute | 256 |
| 203.247.185.0/24 | Korea Electrotechnology Research Institute | 256 |
| 203.247.187.0/24 | KISTI | 256 |
| 203.247.188.0/24 | KISTI | 256 |
| 203.247.190.0/23 | Tongmyong University | 512 |
| 203.247.192.0/20 | KISTI | 4,096 |
| 203.247.216.0/22 | KISTI | 1,024 |
| 203.250.0.0/19 | KISTI | 8,192 |
| 203.250.96.0/21 | KISTI | 2,048 |
| 203.250.110.0/24 | KISTI | 256 |
| 203.250.112.0/21 | KISTI | 2,048 |
| 203.250.155.0/24 | Korea Astronomy and Space Science Institute | 256 |
| 203.250.156.0/22 | Korea Astronomy and Space Science Institute | 1,024 |
| 203.250.156.0/24 | Korea Astronomy and Space Science Institute | 256 |
| 203.250.160.0/21 | KISTI | 2,048 |
| 203.250.172.0/22 | KISTI | 1,024 |
| 203.250.176.0/21 | KISTI | 2,048 |
| 203.250.182.0/24 | KRISO | 256 |
| 203.250.183.0/24 | KRISO | 256 |
| 203.250.192.0/18 | KISTI | 16,384 |
| 203.253.96.0/20 | KISTI | 4,096 |
| 203.253.135.0/24 | KISTI | 256 |
| 203.253.136.0/22 | KISTI | 1,024 |
| 203.253.140.0/22 | KISTI | 1,024 |
| 203.253.224.0/23 | KISTI | 512 |
| 203.253.226.0/24 | KISTI | 256 |
| 203.253.230.0/23 | KISTI | 512 |
| 203.253.234.0/23 | KISTI | 512 |
| 203.253.236.0/24 | KISTI | 256 |
| 203.253.238.0/24 | KISTI | 256 |
| 203.254.40.0/24 | KISTI | 256 |
| 203.254.168.0/23 | KISTI | 512 |
| 203.254.175.0/24 | KISTI | 256 |
| 203.254.176.0/20 | Korea Institute of Geoscience and Mineral Resources | 4,096 |
| 203.254.179.0/24 | KISTI | 256 |
| 203.254.180.0/24 | KISTI | 256 |
| 203.254.181.0/24 | KISTI | 256 |
| 203.254.185.0/24 | KISTI | 256 |
| 203.254.186.0/24 | KISTI | 256 |
| 210.98.5.0/24 | KISTI | 256 |
| 210.98.6.0/23 | KISTI | 512 |
| 210.98.8.0/22 | Korea Institute of Geoscience and Mineral Resources | 1,024 |
| 210.98.12.0/24 | KISTI | 256 |
| 210.98.14.0/23 | Korea Institute of Geoscience and Mineral Resources | 512 |
| 210.98.24.0/23 | KISTI | 512 |
| 210.98.26.0/24 | KISTI | 256 |
| 2001:320::/32 | KISTI | 7.92 × 1028 |
This table only shows the first 100 of the set of IPv4 and IPv6 prefixes. All data is available via our IP data API.
IP ranges are the different blocks of IP addresses advertised by an Autonomous System (AS). These ranges can be used by the same organization operating the AS, or by different organizations.
AS1237 peers with these other Autonomous Systems.
Peering is a direct, often free, traffic exchange between Autonomous Systems (ASNs). They share routes only to their own networks and customers, making connections faster and cheaper for that specific traffic, without providing full internet access to each other.
AS1237 provides internet connectivity to these downstream Autonomous Systems.
A downstream is a customer Autonomous System that pays another AS (its provider) for internet access. The provider AS carries the downstream's traffic and makes its network reachable.
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