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IP Address Lookup ToolIP Address Lookup

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IP data

IP address91.0.0.1
Reverse DNS hostname
OrganizationDeutsche Telekom AG

IP Geolocation

Geolocation resultsIP2Location LITEDB-IP LiteMaxMind GeoLite2
RegionNordrhein-WestfalenNorth Rhine-WestphaliaNorth Rhine-Westphalia
Postal code4021340227
Coordinates51.2217, 6.776251.2217, 6.776251.2070, 6.8058

IP whois

Network Range91.0.0.0 -
Network NameDTAG-DIAL22
DescriptionDeutsche Telekom AG
OrganizationDeutsche Telekom AG, Group Information Security, SDA/Abuse, Deutsche Telekom Allee 9, DE 64295 Darmstadt //abuse contact in case of Spam
Admin ContactDTAG Global IP-Addressing, Deutsche Telekom AG, Darmstadt, Germany, +49 180 2 33 1000
Technical ContactSecurity Team, Deutsche Telekom AG, Darmstadt, Germany, +49 180 2 33 1000
Created10 Jul 2006, 08:51:33 (16 years and 6 months ago)
Last Modified18 Jun 2014, 06:24:45 (8 years and 7 months ago)
Parent Network
DescriptionDeutsche Telekom AG, Internet service provider
Created11 Jul 2006, 08:59:56 (16 years and 6 months ago)
Last Modified11 Jul 2006, 08:59:56 (16 years and 6 months ago)
Parent Network
Network Range91.0.0.0 -
Network Name91-RIPE
OrganizationRIPE Network Coordination Centre
AddressP.O. Box 10096, Amsterdam, 1001EB, Netherlands
Registered30 Jun 2005 (17 years and 7 months ago)
Updated18 May 2009 (13 years and 8 months ago)
CommentThese addresses have been further assigned to users in
the RIPE NCC region. Contact information can be found in
the RIPE database at http://www.ripe.net/whois
Technical contactRIPE NCC Operations, +31 20 535 4444, email
Abuse contactAbuse Contact, +31205354444, email

Autonomous System

OrganizationDeutsche Telekom AG, Eduard-Schopf-Allee 1, D-28217, Bremen, Germany, +4942151555165
DescriptionInternet service provider operations
Admin Contact
Technical Contact
Sebastian Becker, Deutsche Telekom AG, Gartenstrasse 217, DE 48147 Muenster, Germany, +49 228 18123797
Last Modified11 Dec 2020, 15:33:02 (2 years and 1 month ago)


BGP prefix   whois
DescriptionDeutsche Telekom AG, Internet service provider
Prefix registryRIPE
Prefix countryGermany
Allocation date2006-07-03 (16 years and 7 months ago)

IP formats

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Useful resources

What is IP Address Lookup?

IP Address Lookup is a free online tool that reports detailed information about an IP address, including reverse DNS hostname, organization, ASN and IP whois.

It supports both IPv4 and IPv6 address types. You can enter a hostname as well. In this case, the IP address returned by the DNS lookup will be used.

It is also able to find the geolocation of an IP address and show its location on the map. Geolocation includes continent, country, region and city as well as the geographical coordinates (latitude and longitude).

The tool also represents the IP address in different formats: as IPv4, in decimal format and as compressed IPv6.

How it is different from others?

Read about the benefits of our tool here: 7 Reasons Why You Should Choose Our IP Address Lookup Tool.

What is Reverse DNS?

Reverse DNS lookup or reverse DNS resolution (rDNS) is the querying technique of the Domain Name System (DNS) to determine the domain name associated with an IP address. The Reverse DNS Hostname is resolved by querying the DNS server for a pointer (PTR) record. Often used in anti-spam filters.

What is IP Geolocation?

IP-based geolocation is the process of identifying the geographical location of an internet-connected device by its IP address. For better accuracy, we use several IP geolocation databases (IP2Location LITE, DB-IP Lite and MaxMind GeoLite2) and choose the most appropriate result.

What is an IP whois?

WHOIS is a public directory where you can look up "who is" responsible for a domain or IP address. The IP address whois response shows which organization is holding which IP address blocks and their details.

What is an Autonomous System (AS)?

Autonomous System (AS) is a large network or multiple networks with a single routing policy. Basically, it is a collection of IP routing prefixes that allow Internet connected systems to communicate with each other.

What is an ASN?

In order for multiple autonomous systems to interact, each needs to have a unique identifier. An autonomous system number (ASN) is such a unique number used to identify a network on the Internet. AS numbers are assigned in blocks by Internet Assigned Numbers Authority (IANA). As of December 2020, the number of allocated ASNs exceeded 99,000.

What is a BGP prefix?

A BGP prefix is a network address written in CIDR notation (IP address followed by a slash and the bit-length of the subnet mask, for example:, which is advertised via Border Gateway protocol (BGP) and is associated with specific BGP attributes including origin, AS-Path and other information. The primary function of BGP protocol is to exchange routing and reachability information among autonomous systems (AS) on the Internet.

What is a NOC?

NOC stands for Network Operations Center and it is one or more locations from which technicians perform network monitoring or network management tasks.

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