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AS23599
AS23599 Korea Internet Security Agency
DDNSKR-KR-KR - Korea Internet Security Agency · registered in South Korea
IPv4 addresses 1,024 4 prefixes · <0.001% of announced IPv4
Rank in South Korea #470 largest network in KR by IPv4 space, of 853 · <0.01% of KR
Rank worldwide #35,576 of 79,396 networks with IPv4
IPv6 3 x /48 3 prefixes
IPv4 prefixes
All 4 prefixes, in address order.
1.18.123.0/24 1.18.125.0/24 1.18.126.0/24 203.83.159.0/24
IPv6 prefixes
All 3 prefixes.
2001:dcc:4::/48 2001:dcc:401::/48 2001:dcc:403::/48
Other ASNs named Korea Internet Security Agency
9 other networks use the same organisation name; together with AS23599 they announce 15,616 IPv4 addresses.
ASN Name IPv4 addresses
AS9858 KRNICNET-KR - Korea Internet Security Agency KR 5,120 AS23600 GDNSKR-KR-KR - Korea Internet Security Agency KR 3,072 AS9640 KRCERT-AS-KR-KR - Korea Internet Security Agency KR 2,048 AS23596 EDNSKR-KR-KR - Korea Internet Security Agency KR 1,280 AS9642 KISA-KR - Korea Internet Security Agency KR 1,024 AS131100 FDNSKR-AS-KR-KR - Korea Internet Security Agency KR 768 AS131098 BDNSKR-AS-KR-KR - Korea Internet Security Agency KR 512 AS131099 CDNSKR-AS-KR-KR - Korea Internet Security Agency KR 512 AS9755 RPKINET1-KR - Korea Internet Security Agency KR 256
Similar-sized networks in South Korea
ASN Name IPv4 addresses
AS38426 #467 KREI-AS-KR-KR - KOREA RURAL ECONOMIC INSTITUTE1,152 AS9639 #468 ARTISTCOMPANY-AS-KR-KR - Artist Company Inc.1,024 AS142273 #469 DRKL-AS-AP - Digital Realty Korea Ltd.1,024 AS9454 #471 WTKR-AS-KR-KR - Watch Tower Bible and Tract Society of Korea1,024 AS9522 #472 GOODCYBER-AS-KR - Shinhan Securities Co.,Ltd.1,024 AS9628 #473 TONGYANGLIFE-AS-KR-KR - TONGYANG LIFE INSURANCE CO., LTD.1,024
IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources