121.133.148.0/22
AS4766 · Korea Telecom
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inetnum: 121.128.0.0 - 121.159.255.255 netname: KORNET descr: Korea Telecom admin-c: IM667-AP tech-c: IM667-AP country: KR status: ALLOCATED PORTABLE mnt-by: MNT-KRNIC-AP mnt-irt: IRT-KRNIC-KR changed: hostmaster@nic.or.kr 20170203 source: APNIC irt: IRT-KRNIC-KR address: Seoul Songpa-gu Jungdae-ro 135 e-mail: hostmaster@nic.or.kr abuse-mailbox: hostmaster@nic.or.kr admin-c: IM574-AP tech-c: IM574-AP auth: # Filtered mnt-by: MNT-KRNIC-AP changed: hostmaster@nic.or.kr 20150513 source: APNIC person: IP Manager address: Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90 country: KR phone: +82-2-500-6630 e-mail: kornet_ip@kt.com nic-hdl: IM667-AP mnt-by: MNT-KRNIC-AP changed: hostmaster@nic.or.kr 20170328 source: APNIC inetnum: 121.128.0.0 - 121.159.255.255 netname: KORNET-KR descr: Korea Telecom country: KR admin-c: IA9-KR tech-c: IM9-KR status: ALLOCATED PORTABLE mnt-by: MNT-KRNIC-AP mnt-irt: IRT-KRNIC-KR remarks: This information has been partially mirrored by APNIC from remarks: KRNIC. To obtain more specific information, please use the remarks: KRNIC whois server at whois.krnic.net. changed: hostmaster@nic.or.kr source: KRNIC person: IP Manager address: Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90 address: country: KR phone: +82-2-500-6630 e-mail: kornet_ip@kt.com nic-hdl: IA9-KR mnt-by: MNT-KRNIC-AP changed: hostmaster@nic.or.kr source: KRNIC person: IP Manager address: Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90 address: country: KR phone: +82-2-500-6630 e-mail: kornet_ip@kt.com nic-hdl: IM9-KR mnt-by: MNT-KRNIC-AP changed: hostmaster@nic.or.kr source: KRNIC
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What are IP address ranges?
IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.
Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.
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