NetRange: 100.128.0.0 - 100.255.255.255
CIDR: 100.128.0.0/9
NetName: CORE2
NetHandle: NET-100-128-0-0-1
Parent: NET100 (NET-100-0-0-0-0)
NetType: Direct Allocation
OriginAS:
Organization: T-Mobile USA, Inc. (TMOBI)
RegDate: 2012-02-27
Updated: 2012-05-24
Ref: https://rdap.arin.net/registry/ip/100.128.0.0

OrgName: T-Mobile USA, Inc.
OrgId: TMOBI
Address: 12920 SE 38th Street
City: Bellevue
StateProv: WA
PostalCode: 98006
Country: US
RegDate: 2003-01-02
Updated: 2017-01-28
Ref: https://rdap.arin.net/registry/entity/TMOBI

OrgTechHandle: DNSAD11-ARIN
OrgTechName: DNS Administrators
OrgTechPhone: +1-888-662-4662
OrgTechEmail: ARINtechcontact@t-mobile.com
OrgTechRef: https://rdap.arin.net/registry/entity/DNSAD11-ARIN

OrgAbuseHandle: ABUSE4857-ARIN
OrgAbuseName: abuse
OrgAbusePhone: +1-888-662-4662
OrgAbuseEmail: abuse@t-mobile.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/ABUSE4857-ARIN

DNSBL* - is a list of IP addresses published through the Internet Domain Name Service (DNS) either as a zone file that can be used by DNS server software, or as a live DNS zone that can be queried in real-time. DNSBLs are most often used to publish the addresses of computers or networks linked to spamming; most mail server software can be configured to reject or flag messages which have been sent from a site listed on one or more such lists.

WHOIS** - is a query/response protocol that is widely used for querying databases in order to determine the registrant or assignee of Internet resources, such as a domain name, an IP address block, or an autonomous system number. WHOIS lookups were traditionally performed with a command line interface application, and network administrators predominantly still use this method, but many simplified web-based tools exist. WHOIS services are typically communicated using the Transmission Control Protocol (TCP). Servers listen to requests on the well-known port number 43.

** Approximate Geographic Location - This is NOT the exact geographical location of the person/organization with the given IP address. However, this should still give you a good idea about the area/region where this person/orgranization is located.