203.163.0.0/18
AS2687 · AT&T Enterprises, LLC
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inetnum: 203.163.0.0 - 203.163.63.255 netname: ATT-MPN-AP descr: IBM Global Network Operations descr: IBM Japan, Ltd. descr: Tokyo country: JP org: ORG-AJK1-AP admin-c: AD103-AP tech-c: AD103-AP abuse-c: AA1420-AP status: ALLOCATED PORTABLE remarks: service provider mnt-by: APNIC-HM mnt-lower: MAINT-AP-OPENNET mnt-irt: IRT-ATT-OPENNET-AP last-modified: 2020-07-07T05:02:08Z source: APNIC irt: IRT-ATT-OPENNET-AP address: All of AP e-mail: peering@intl.att.com abuse-mailbox: peering@intl.att.com admin-c: DR7890-AP tech-c: DR7890-AP auth: # Filtered remarks: peering@intl.att.com was validated on 2024-10-30 mnt-by: MAINT-AP-OPENNET last-modified: 2024-10-30T02:09:19Z source: APNIC organisation: ORG-AJK1-AP org-name: AT&T Japan K.K. org-type: LIR country: JP address: Toranomon Twin Bldg address: 2-10-1 Toranomon address: AT&T PO: PR515809 phone: +81-3-3582-2304 fax-no: +81-3-3505-1771 e-mail: peering@intl.att.com mnt-ref: APNIC-HM mnt-by: APNIC-HM last-modified: 2023-09-05T02:14:44Z source: APNIC role: ABUSE ATTOPENNETAP country: ZZ address: All of AP phone: +000000000 e-mail: peering@intl.att.com admin-c: DR7890-AP tech-c: DR7890-AP nic-hdl: AA1420-AP remarks: Generated from irt object IRT-ATT-OPENNET-AP remarks: peering@intl.att.com was validated on 2024-10-30 abuse-mailbox: peering@intl.att.com mnt-by: APNIC-ABUSE last-modified: 2024-10-30T02:10:05Z source: APNIC role: AGNS DOMCUST address: Shinnikko-Building, 2-10-1, address: Toranomon, Minato-ku, address: TOKYO, 105-0001, Japan country: JP phone: +81-3-3584-4776 fax-no: +81-3-3505-1771 e-mail: IPAddadmin@jp.att.com remarks: Send spam or abuse report to abuse@att.net remarks: and please include detailed information and time. remarks: Send general query to IPAddadmin@jp.att.com. admin-c: dr7890-AP tech-c: dr7890-AP nic-hdl: AD103-AP notify: IPAddadmin@jp.att.com mnt-by: MAINT-AP-OPENNET last-modified: 2015-08-10T11:30:02Z source: APNIC
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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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