KRNIC is not an ISP but a National Internet Registry similar to APNIC.

[ Network Information ]
IPv4 Address       : 221.138.0.0 - 221.143.255.255 (/14+/15)
Organization Name  : SK Broadband Co Ltd
Service Name       : broadNnet
Address            : Seoul Jung-gu Toegye-ro 24
Zip Code           : 04637
Registration Date  : 20030602

Name               : IP Manager
Phone              : +82-80-828-2106
E-Mail             : ip-adm@skbroadband.com

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More specific assignment information is as follows.

[ Network Information ]
IPv4 Address       : 221.142.58.0 - 221.142.58.255 (/24)
Organization Name  : Chungang University
Network Type       : CUSTOMER
Address            : Seoul Dongjak-gu Heukseok-ro 6
Zip Code           : 06969
Registration Date  : 20160129

Name               : IP Manager
Phone              : +82-2-820-6150
E-Mail             : artcenter8@korea.com


- KISA/KRNIC WHOIS Service -