SEJONG NETWORKS

Data as of 2026-09-06
BGP inherited
Complete entity footprint
2 linked clusters · 242 netblocks · 1,455,622 IPv4 addresses · 11 IPv6 prefixes
This organisation's clusters combined by evidence — shared operating domain donghwan.co.kr — not name similarity, so genuinely different organisations that share a name are excluded.
View the full entity page →
This organisation
Netblocks173 · 990,728 IPv4 addresses
IPv6 11 prefixes (largest 2001:3a8::/32)
Registered in South Korea (156) · United States (4) · Hong Kong (2)
Record ID236344627
RegistryBGP
Customerssee who runs inside this network →
Evidence & provenance ?
Attribution BGP parent (inherited)
Shared handles clustered on 3 shared RIR contact/maintainer handles
Registry names 2 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works · report an issue

IP Ranges (173)

⬇ export CSV
CIDR Org name Registry Status Confidence
36.255.56.94/32 Sejong Networks PEERINGDB ASSIGNED ● high
36.255.56.191/32 Sejong Networks PEERINGDB ASSIGNED ● high
58.180.7.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
58.180.133.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
58.180.136.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
61.97.64.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
61.97.96.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
61.97.96.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
61.97.96.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
61.100.0.0/17 SEJONG NETWORKS BGP ANNOUNCED ● high
61.100.128.0/18 SEJONG NETWORKS BGP ANNOUNCED ● high
61.109.128.0/17 SEJONG NETWORKS BGP ANNOUNCED ● high
61.109.211.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
61.111.179.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
61.250.64.0/18 SEJONG NETWORKS BGP ANNOUNCED ● high
61.252.160.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
61.252.176.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
64.23.64.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
66.232.136.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
66.232.140.0/22 SEJONG NETWORKS BGP ANNOUNCED ● high
66.232.144.0/22 SEJONG NETWORKS BGP ANNOUNCED ● high
139.150.100.156/32 Sejong Networks PEERINGDB ASSIGNED ● high
139.150.100.157/32 Sejong Networks PEERINGDB ASSIGNED ● high
163.223.95.19/32 Sejong Networks PEERINGDB ASSIGNED ● high
163.223.95.20/32 Sejong Networks PEERINGDB ASSIGNED ● high
202.30.209.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
202.30.210.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
202.30.212.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
202.30.213.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
202.30.217.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
202.30.232.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
202.30.233.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
202.30.234.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
202.30.235.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
202.30.236.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
202.30.237.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
202.30.238.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
202.30.239.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
202.30.240.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
202.30.241.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
202.30.242.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
202.30.243.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
202.30.249.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.227.0.0/16 SEJONG NETWORKS BGP ANNOUNCED ● high
203.227.32.0/19 SEJONG NETWORKS BGP ANNOUNCED ● high
203.227.176.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
203.231.0.0/16 SEJONG NETWORKS BGP ANNOUNCED ● high
203.231.97.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.231.104.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
203.231.224.0/19 SEJONG NETWORKS BGP ANNOUNCED ● high
203.235.0.0/17 SEJONG NETWORKS BGP ANNOUNCED ● high
203.235.40.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.235.96.0/22 SEJONG NETWORKS BGP ANNOUNCED ● high
203.235.128.0/18 SEJONG NETWORKS BGP ANNOUNCED ● high
203.235.144.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
203.235.185.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.236.128.0/18 SEJONG NETWORKS BGP ANNOUNCED ● high
203.236.144.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
203.238.0.0/17 SEJONG NETWORKS BGP ANNOUNCED ● high
203.238.38.0/23 SEJONG NETWORKS BGP ANNOUNCED ● high
203.239.0.0/17 SEJONG NETWORKS BGP ANNOUNCED ● high
203.239.31.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.239.33.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.239.111.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.240.132.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.240.133.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.240.134.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.240.144.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.240.145.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.240.146.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.240.147.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.240.148.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.240.153.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.240.194.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.240.244.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.243.128.0/17 SEJONG NETWORKS BGP ANNOUNCED ● high
203.243.128.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
203.248.0.0/17 SEJONG NETWORKS BGP ANNOUNCED ● high
203.248.80.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
203.248.94.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.251.246.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.251.249.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.251.250.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.251.252.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.251.253.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
203.255.112.0/23 SEJONG NETWORKS BGP ANNOUNCED ● high
203.255.114.1/32 Sejong Networks PEERINGDB ASSIGNED ● high
203.255.115.1/32 Sejong Networks PEERINGDB ASSIGNED ● high
203.255.116.0/22 SEJONG NETWORKS BGP ANNOUNCED ● high
203.255.128.0/19 SEJONG NETWORKS BGP ANNOUNCED ● high
210.98.64.0/18 SEJONG NETWORKS BGP ANNOUNCED ● high
210.103.128.0/17 SEJONG NETWORKS BGP ANNOUNCED ● high
210.109.0.0/16 SEJONG NETWORKS BGP ANNOUNCED ● high
210.109.200.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
210.112.0.0/17 SEJONG NETWORKS BGP ANNOUNCED ● high
210.112.16.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
210.112.32.0/19 SEJONG NETWORKS BGP ANNOUNCED ● high
210.112.64.0/19 SEJONG NETWORKS BGP ANNOUNCED ● high
210.112.117.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
210.116.0.0/18 SEJONG NETWORKS BGP ANNOUNCED ● high
210.116.128.0/17 SEJONG NETWORKS BGP ANNOUNCED ● high
210.116.246.0/23 SEJONG NETWORKS BGP ANNOUNCED ● high
210.118.135.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
210.118.138.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
210.118.236.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
210.118.237.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
210.121.0.0/17 SEJONG NETWORKS BGP ANNOUNCED ● high
210.121.40.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
210.121.56.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
210.122.0.0/16 SEJONG NETWORKS BGP ANNOUNCED ● high
210.122.160.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
210.122.230.0/23 SEJONG NETWORKS BGP ANNOUNCED ● high
210.122.248.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
210.126.128.0/17 SEJONG NETWORKS BGP ANNOUNCED ● high
210.126.152.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
210.126.224.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
210.126.232.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
210.127.64.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
210.127.64.0/18 SEJONG NETWORKS BGP ANNOUNCED ● high
210.127.128.0/18 SEJONG NETWORKS BGP ANNOUNCED ● high
211.36.192.0/22 SEJONG NETWORKS BGP ANNOUNCED ● high
211.36.192.0/19 SEJONG NETWORKS BGP ANNOUNCED ● high
211.36.196.0/22 SEJONG NETWORKS BGP ANNOUNCED ● high
211.36.200.0/22 SEJONG NETWORKS BGP ANNOUNCED ● high
211.36.204.0/22 SEJONG NETWORKS BGP ANNOUNCED ● high
211.36.208.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
211.39.160.0/19 SEJONG NETWORKS BGP ANNOUNCED ● high
211.43.160.0/19 SEJONG NETWORKS BGP ANNOUNCED ● high
211.56.192.0/19 SEJONG NETWORKS BGP ANNOUNCED ● high
211.111.128.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
211.111.144.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
211.111.144.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
211.115.192.0/19 SEJONG NETWORKS BGP ANNOUNCED ● high
211.116.176.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
211.116.191.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
211.116.192.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
211.172.96.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
211.172.96.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
211.172.104.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
211.189.160.0/19 SEJONG NETWORKS BGP ANNOUNCED ● high
211.189.164.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
211.189.168.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
211.190.5.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
211.190.37.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
211.236.224.0/19 SEJONG NETWORKS BGP ANNOUNCED ● high
211.236.224.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
211.236.224.0/22 SEJONG NETWORKS BGP ANNOUNCED ● high
211.236.232.0/22 SEJONG NETWORKS BGP ANNOUNCED ● high
211.236.236.0/22 SEJONG NETWORKS BGP ANNOUNCED ● high
211.238.0.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
211.238.16.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
211.238.16.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
211.239.0.0/17 SEJONG NETWORKS BGP ANNOUNCED ● high
211.239.128.0/18 SEJONG NETWORKS BGP ANNOUNCED ● high
211.239.192.0/18 SEJONG NETWORKS BGP ANNOUNCED ● high
211.239.193.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
211.239.201.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
211.239.202.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
211.239.236.0/24 SEJONG NETWORKS BGP ANNOUNCED ● high
211.255.224.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
211.255.240.0/21 SEJONG NETWORKS BGP ANNOUNCED ● high
211.255.240.0/20 SEJONG NETWORKS BGP ANNOUNCED ● high
2001:3a8::/32 SEJONG NETWORKS BGP ANNOUNCED ● high
2001:3a8:7000:0:114:0:9848:1/128 Sejong Networks PEERINGDB ASSIGNED ● high
2001:3a8:7000:0:115:0:9848:1/128 Sejong Networks PEERINGDB ASSIGNED ● high
2001:3a8:80b4:d::1/128 SEJONG NETWORKS BGP ANNOUNCED ● high
2001:7fa:8::256/128 Sejong Networks PEERINGDB ASSIGNED ● high
2001:7fa:8::257/128 Sejong Networks PEERINGDB ASSIGNED ● high
2001:cf0::/32 SEJONG NETWORKS BGP ANNOUNCED ● high
2001:de8:7::9848:1/128 Sejong Networks PEERINGDB ASSIGNED ● high
2001:de8:7::9848:2/128 Sejong Networks PEERINGDB ASSIGNED ● high
2401:f560::19/128 Sejong Networks PEERINGDB ASSIGNED ● high
2401:f560::20/128 Sejong Networks PEERINGDB ASSIGNED ● high

IPv6 ranges (11)

CIDR
2001:3a8::/32
2001:cf0::/32
2001:3a8:7000:0:114:0:9848:1/128
2001:3a8:7000:0:115:0:9848:1/128
2001:3a8:80b4:d::1/128
2001:7fa:8::256/128
2001:7fa:8::257/128
2001:de8:7::9848:1/128
2001:de8:7::9848:2/128
2401:f560::19/128
2401:f560::20/128

Footprint over time

11 weekly snapshots · JSON
173 +8 netblocks since 2026-07-05
2026-07-05 peak 173 2026-09-06

Customer-delegated space

how is this classified?
Unclassified 157 (90.8%)
Operator infrastructure (named) 16 (9.2%)

Network trust

what's this?
RPKI hygiene: F how networks compare →
2.3% of checked blocks have valid RPKI ROA coverage (4 of 173)
No discrepancies found among checked blocks.

NIC Handles

AS38425 AS9848 AS9848