138.243.192.0/19
AS23779 · NTT Communications Corporation
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inetnum: 138.243.0.0 - 138.243.255.255 netname: N-BONE descr: NTT Communications Corporation descr: 2-3-5 Ootemachi descr: Chiyoda-ku Tokyo country: JP org: ORG-NCC3-AP admin-c: NK67-AP tech-c: HM99-AP abuse-c: AN799-AP status: ALLOCATED PORTABLE mnt-by: APNIC-HM mnt-irt: IRT-N-BONE-NET-JP last-modified: 2020-06-23T00:42:16Z source: APNIC irt: IRT-N-BONE-NET-JP address: 2-3-4 Ootemachi, Chiyoda-ku, Tokyo 100-0004 JAPAN e-mail: apnic-irt@n-bone.net abuse-mailbox: apnic-irt@n-bone.net admin-c: NK67-AP tech-c: NK67-AP auth: # Filtered remarks: apnic-irt@n-bone.net was validated on 2024-07-31 mnt-by: MAINT-JP-NBONE last-modified: 2024-07-31T07:28:46Z source: APNIC organisation: ORG-NCC3-AP org-name: NTT Communications Corporation org-type: LIR country: JP address: NTT Ohtemachi Building Annex 7F address: 2-3-4 Ohtemachi phone: +81-50-3812-4481 e-mail: apnic-adm@n-bone.net mnt-ref: APNIC-HM mnt-by: APNIC-HM last-modified: 2023-09-05T02:15:50Z source: APNIC role: ABUSE NBONENETJP country: ZZ address: 2-3-4 Ootemachi, Chiyoda-ku, Tokyo 100-0004 JAPAN phone: +000000000 e-mail: apnic-irt@n-bone.net admin-c: NK67-AP tech-c: NK67-AP nic-hdl: AN799-AP remarks: Generated from irt object IRT-N-BONE-NET-JP remarks: apnic-irt@n-bone.net was validated on 2024-07-31 abuse-mailbox: apnic-irt@n-bone.net mnt-by: APNIC-ABUSE last-modified: 2024-07-31T07:29:32Z source: APNIC person: Hisayoshi Masuyama nic-hdl: HM99-AP e-mail: mas@n-bone.net address: 2-1-1 Uchisaiwai-cho, Chiyoda-ku, Tokyo 100-0011 JAPAN phone: +81-3-6800-6796 fax-no: +81-3-5501-3018 country: JP mnt-by: MAINT-JP-N-BONE last-modified: 2008-09-04T07:29:34Z source: APNIC person: Naoyuki Kasamatsu nic-hdl: NK67-AP e-mail: kasa@n-bone.net address: 2-1-1 Uchisaiwai-cho, Chiyoda-ku, Tokyo 100-0011 JAPAN phone: +81-3-6800-6796 fax-no: +81-3-5501-3018 country: JP mnt-by: MAINT-JP-N-BONE last-modified: 2008-09-04T07:29:34Z source: APNIC
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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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