- IP Address Lookup

The IP address location of is Boulder 80303, Colorado (CO), United States (US). is a public IP address that belongs to ASN 49 which is under the control of US National Institute of Standards & Technology. The prefix 132/8 ( was delegated for administration to ARIN by the Internet Assigned Numbers Authority (IANA) in . IP Address Location

Here you will find the approximate IP geolocation for as reported by our IP Tracker along with additional information like ASN mapping, ISP, and the type of internet connection. Use the free IP Lookup tool to find the IP geolocation for any public IP address.

IP PTR / DNS Reverse Lookuptime-b-b.nist.gov
IP Address ASN49 controlled by US National Institute of Standards & Technology
IP Address ISPNational Institute of Standards and Technology
IP OrganizationUS National Institute of Standards & Technology
IP Connection TypeCorporate [internet speed test]
IP Location ContinentNorth America
IP Location CountryUnited States (US)
IP Location StateColorado (CO)
IP Location CityBoulder
IP Location Postcode80303
IP Location Latitude39.9668 / 39°58′0″ N
IP Location Longitude-105.2092 / 105°12′33″ W
IP Location TimezoneAmerica/Denver
IP Location Local Time

IANA IPv4 Address Space Allocation for Subnet

The Internet Assigned Numbers Authority (IANA) is responsible for global IP address space allocation to Regional Internet Registries (RIRs). The available IPv4 address space is typically allocated to RIRs as /8 prefix blocks, and the RIRs delegate smaller blocks of their address pools to Local Internet Registries (LIRs) like Internet Service Providers and other organizations in their designated locations.

IPv4 Address Space Prefix132/8
Regional Internet Registry (RIR)Administered by ARIN
Allocation Date
WHOIS Serverwhois.arin.net
RDAP Serverhttps://rdap.arin.net/registry, http://rdap.arin.net/registry
Allocated by the central Internet Registry (IR) prior to the Regional Internet Registries (RIRs). This address space is now administered by individual RIRs as noted, including maintenance of WHOIS Directory and reverse DNS records. Assignments from these blocks are distributed globally on a regional basis. Reverse IP Lookup

Reverse IP address lookup is the process of mapping an IP address to its corresponding hostnames. Below you will find a list of hostnames that resolve to IP address

  • time-b-b.nist.gov
  • ntp1.glb.nist.gov
  • time.nist.gov
  • time-b.timefreq.bldrdoc.gov IP Address Representations

An IPv4 address is defined as a 32-bit number, and thus it can be written in any notation that is capable of representing a 32-bit integer value. If human-readability is a requirement, IPv4 addresses are most often expressed in quad-dotted decimal notation with 4 octets ranging from 0 to 255 each.
Note: You should avoid IP addresses with zero-padded decimal octets like or because they might impose an ambiguity with octal numbers.
Below you can find some ways to express an IPv4 address.

CIDR Notation132.163.96.2/32
Decimal Notation2225299458
Hexadecimal Notation0x84a36002
Octal Notation020450660002
Binary Notation10000100101000110110000000000010
Dotted-Decimal Notation132.163.96.2
Dotted-Hexadecimal Notation0x84.0xa3.0x60.0x02
Dotted-Octal Notation0204.0243.0140.02
Dotted-Binary Notation10000100.10100011.01100000.00000010

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