HomePrefix Lookup121.128.0.0/12

121.128.0.0/12

🇰🇷
IPv4APNICannouncedAS4766KIXS-AS-KR-KR - Korea TelecomNo ROA
CIDR
121.128.0.0/12
IP Version
IPv4
Addresses
1M
Mask
/12 (255.240.0.0)
Country
🇰🇷 South Korea
City
Seongnam-si
RIR
APNIC
Status
announced
Allocated
-

Announced BGP Routes

1 of 1 route
RPKI:
IRR:
PrefixOrigin ASRPKIIRRLast Seen
121.128.0.0/12AS4766KIXS-AS-KR-KR - Korea TelecomNo ROA
RADB
5/31/2026

Covering Prefix

59 less-specific announcements
PrefixOrigin ASRPKIIRRLast Seen
121.128.0.0/11AS4766KIXS-AS-KR-KR - Korea TelecomNo ROA—5/31/2026
121.136.0.0/13AS4766KIXS-AS-KR-KR - Korea TelecomNo ROA—5/31/2026
121.128.0.0/13AS4766KIXS-AS-KR-KR - Korea TelecomNo ROA—5/31/2026
121.139.137.0/24AS3786LGDACOM-KR - LG DACOM CorporationNo ROA—5/31/2026
121.141.42.0/24AS4766KIXS-AS-KR-KR - Korea TelecomNo ROA—5/31/2026
121.137.151.0/24AS4766KIXS-AS-KR-KR - Korea TelecomNo ROA—5/31/2026
121.137.185.0/24AS4766KIXS-AS-KR-KR - Korea TelecomNo ROA—5/31/2026
121.128.29.0/24AS4790CHOSUN-AS-KR-KR - Chosun ilbo Inc.No ROA—5/31/2026
121.128.166.0/24AS4790CHOSUN-AS-KR-KR - Chosun ilbo Inc.No ROA—5/31/2026
121.128.28.0/24AS4790CHOSUN-AS-KR-KR - Chosun ilbo Inc.No ROA—5/31/2026
121.138.156.0/24AS9273SICC-AS-KR - ITCENENTEC CO.,LTD.No ROA—5/31/2026
121.140.76.0/24AS9524HMC-AS-KR - Hyundai Autoever Corp.No ROA—5/31/2026
121.141.229.0/24AS9526KOSCOM-AS-KR-KR - KOSCOMNo ROA—5/31/2026
121.141.60.0/24AS9526KOSCOM-AS-KR-KR - KOSCOMNo ROA—5/31/2026
121.140.97.0/24AS9530SHINSEGAE-AS-KR - SHINSEGAE I C Co., Ltd.No ROA—5/31/2026
121.128.55.0/24AS9647SEOULMETRO-AS-KR - Seoul Metropolitan GovernmentNo ROA—5/31/2026
121.128.219.0/24AS9647SEOULMETRO-AS-KR - Seoul Metropolitan GovernmentNo ROA—5/31/2026
121.130.47.0/24AS9684HANWHA-AS-KR - HANWHA Corp. Information Service div.No ROA—5/31/2026
121.130.46.0/24AS9684HANWHA-AS-KR - HANWHA Corp. Information Service div.No ROA—5/31/2026
121.135.246.0/24AS9696EDAS-AS-KR - Oscar EnterpriseNo ROA—5/31/2026
121.129.49.0/24AS9776KBSTAR-KR - KOOKMIN BANKNo ROA—5/31/2026
121.141.101.0/24AS9776KBSTAR-KR - KOOKMIN BANKNo ROA—5/31/2026
121.131.217.0/24AS9856WOORIWM-AS-KR-KR - WOORI Investment @ SecuritiesNo ROA—5/31/2026
121.143.242.0/24AS9968KYOBO-AS-KR - KYOBO Life Insurance Co., Ltd.No ROA—5/31/2026
121.131.7.0/24AS10040NICEVAN-AS-KR-KR - NICE Information Telecommunication, IncNo ROA—5/31/2026
121.134.234.0/24AS18333ATNET-AS-KR-KR - at(Korea Argo-Fisheries Food Trade Corporation)No ROA—5/31/2026
121.139.137.0/24AS23591LS-AS-KR-KR - LS ITCNo ROA—5/31/2026
121.128.225.0/24AS38122SGIC-AS-KR-KR - Seoul Guarantee Insurance CompanyNo ROA—5/31/2026
121.128.224.0/24AS38122SGIC-AS-KR-KR - Seoul Guarantee Insurance CompanyNo ROA—5/31/2026
121.131.145.0/24AS38126SCI-AS-KR-KR - Seoul Information Service Inc.No ROA—5/31/2026
121.133.198.0/24AS38394GOESN-AS-KR-KR - Gyeonggido Seongnam Office of EducationNo ROA—5/31/2026
121.133.199.0/24AS38395GOE-AS-KR-KR - GwangJuHaNam Office of EducationNo ROA—5/31/2026
121.133.203.0/24AS38399GOEYJ-AS-KR-KR - Gyeonggi-do Yeoju Office of EducationNo ROA—5/31/2026
121.133.209.0/24AS38412GOEIC-AS-KR-KR - Gyeonggi-Do Icheon office of EducationNo ROA—5/31/2026
121.135.56.0/24AS38697MOK9882-AS-KR-KR - Hankyong National UnivercityNo ROA—5/31/2026
121.135.55.0/24AS38697MOK9882-AS-KR-KR - Hankyong National UnivercityNo ROA—5/31/2026
121.135.54.0/24AS38697MOK9882-AS-KR-KR - Hankyong National UnivercityNo ROA—5/31/2026
121.135.53.0/24AS38697MOK9882-AS-KR-KR - Hankyong National UnivercityNo ROA—5/31/2026
121.133.126.0/24AS45401NICEVAN02-AS-KR-KR - NICE Information Telecommunication, IncNo ROA—5/31/2026
121.135.147.0/24AS46002PHIS-AS-KR-KR - PHISNo ROA—5/31/2026
121.135.148.0/24AS46002PHIS-AS-KR-KR - PHISNo ROA—5/31/2026
121.137.95.0/24AS46009YABESK-AS-KR-KR - YABESKNo ROA—5/31/2026
121.137.94.0/24AS46009YABESK-AS-KR-KR - YABESKNo ROA—5/31/2026
121.137.90.0/24AS46009YABESK-AS-KR-KR - YABESKNo ROA—5/31/2026
121.137.89.0/24AS46009YABESK-AS-KR-KR - YABESKNo ROA—5/31/2026
121.137.105.0/24AS46009YABESK-AS-KR-KR - YABESKNo ROA—5/31/2026
121.137.106.0/24AS46009YABESK-AS-KR-KR - YABESKNo ROA—5/31/2026
121.137.107.0/24AS46009YABESK-AS-KR-KR - YABESKNo ROA—5/31/2026
121.137.88.0/24AS46009YABESK-AS-KR-KR - YABESKNo ROA—5/31/2026
121.137.87.0/24AS46009YABESK-AS-KR-KR - YABESKNo ROA—5/31/2026
121.137.96.0/24AS46009YABESK-AS-KR-KR - YABESKNo ROA—5/31/2026
121.140.50.0/24AS55592KDT-AS-KR-KR - Korea Data Telecommunication Co., Ltd.No ROA—5/31/2026
121.140.118.0/24AS55592KDT-AS-KR-KR - Korea Data Telecommunication Co., Ltd.No ROA—5/31/2026
121.140.137.0/24AS55592KDT-AS-KR-KR - Korea Data Telecommunication Co., Ltd.No ROA—5/31/2026
121.140.104.0/24AS55592KDT-AS-KR-KR - Korea Data Telecommunication Co., Ltd.No ROA—5/31/2026
121.138.30.0/24AS55630KSNET-AS-KR-KR - KSNET.IncNo ROA—5/31/2026
121.138.29.0/24AS55630KSNET-AS-KR-KR - KSNET.IncNo ROA—5/31/2026
121.131.216.0/24AS152214KOREANAIRLINES-AS-KR-KR - Korean Air LinesNo ROA—5/31/2026
121.128.97.0/24AS152214KOREANAIRLINES-AS-KR-KR - Korean Air LinesNo ROA—5/31/2026

IRR Route Objects

1
OriginRegistryMaintainerModified
AS4766RADBMAINT-AS476611/13/2023
Origin ASN
AS4766
KIXS-AS-KR-KR - Korea Telecom
Geolocation
Country🇰🇷South KoreaKR
RegionGyeonggi-do
CitySeongnam-si
Coordinates37.3668, 127.1080 ↗
API
Open
GEThttps://api.ipctl.io/v1/prefix/121.128.0.0/12

Returns prefix allocation, BGP routes, and more-specific subnets.

curl -s "https://api.ipctl.io/v1/prefix/121.128.0.0/12" | jq
External Links
RIPEstat Hurricane Electric BGP