128.231.128.251 - IP Address Lookup

The IP address location of 128.231.128.251 is Bethesda 20817, Maryland (MD), United States (US).

128.231.128.251 is a public IP address that belongs to ASN 3527 which is under the control of National Institutes of Health. The prefix 128/8 (128.0.0.0/8) was delegated for administration to ARIN by the Internet Assigned Numbers Authority (IANA) in .

128.231.128.251 IP Address Location

Here you will find the approximate IP geolocation for 128.231.128.251 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 Lookupns.nih.gov
IP Address ASN3527 controlled by National Institutes of Health
IP ISP / OrganizationNational Institutes of Health
IP Connection TypeCable/DSL [internet speed test]
IP Location ContinentNorth America
IP Location CountryUnited States (US)
IP Location StateMaryland (MD)
IP Location CityBethesda
IP Location Postcode20817
IP Location Latitude39.0032 / 39°0′11″ N
IP Location Longitude-77.1602 / 77°9′36″ W
IP Location TimezoneAmerica/New_York
IP Location Local Time

IANA IPv4 Address Space Allocation for Subnet 128.0.0.0/8

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 Prefix128/8
Regional Internet Registry (RIR)Administered by ARIN
Allocation Date
WHOIS Serverwhois.arin.net
RDAP Serverhttps://rdap.arin.net/registry, http://rdap.arin.net/registry
StatusLEGACY
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.

128.231.128.251 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 128.231.128.251.

  • ns.nih.gov

128.231.128.251 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 010.010.010.010 because they might impose an ambiguity with octal numbers.
Below you can find some ways to express an IPv4 address.

Decimal Notation2162655483
Hexadecimal Notation0x80e780fb
Octal Notation020071700373
Binary Notation10000000111001111000000011111011
Dotted-Decimal Notation128.231.128.251
Dotted-Hexadecimal Notation0x80.0xe7.0x80.0xfb
Dotted-Octal Notation0200.0347.0200.0373
Dotted-Binary Notation10000000.11100111.10000000.11111011

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