21.6.81.0 - IP Address Lookup

The IP address location of 21.6.81.0 is United States (US).

21.6.81.0 is a public IP address that belongs to ASN 0 which is under the control of . The prefix 021/8 (21.0.0.0/8) was allocated to DDN-RVN by the Internet Assigned Numbers Authority (IANA) in .

21.6.81.0 IP Address Location

Here you will find the approximate IP geolocation for 21.6.81.0 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 ISP / OrganizationDoD Network Information Center
IP Connection TypeCorporate [internet speed test]
IP Location ContinentNorth America
IP Location CountryUnited States (US)
IP Location Latitude37.7510 / 37°45′3″ N
IP Location Longitude-97.8220 / 97°49′19″ W

IANA IPv4 Address Space Allocation for Subnet 21.0.0.0/8

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 Prefix021/8
Regional Internet Registry (RIR)DDN-RVN
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.

21.6.81.0 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 021.006.081.000 or 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 Notation352735488
Hexadecimal Notation0x15065100
Octal Notation02501450400
Binary Notation 10101000001100101000100000000
Dotted-Decimal Notation21.6.81.0
Dotted-Hexadecimal Notation0x15.0x06.0x51.0x00
Dotted-Octal Notation025.06.0121.00
Dotted-Binary Notation00010101.00000110.01010001.00000000

21.6.81.0 Common Typing Errors

You might encounter misspelled IP addresses containing "o", "l" or "I" characters instead of digits. The following list includes some typical typing errors for 21.6.81.0.

  • 21.6.81.o

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