What is my IP address?

Your IP address is
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This is the public IP address of your computer. If your computer is behind a router or used a proxy server to view this page, the IP address shown is your router or proxy server.

Do you want to find an IP address of your network printer? Please read "How to find an IP of a printer" to find ways to obtain an IP number of your network printer.

Do you want to find IP Addresses of private network? Please read How to find IP addresses of computing devices on the private network?

  IP Address:
  Host Name:   ec2-50-19-53-104.compute-1.amazonaws.com
  Host Location:   Ashburn, Virginia United States [more]
  Mobile Device:   No
  Current Time:   Wednesday, October 07, 2015 03:21:34 AM CDT

What is IP Address?

Internet Protocol Address (or IP Address) is an unique address that computing devices use to identify itself and communicate with other devices in the Internet Protocol network. Any device connected to the IP network must have an unique IP address within its network. An IP address is analogous to a street address or telephone number in that it is used to uniquely identify a network device to deliver mail message, or call ("view") a website.

Dotted Decimals

The traditional IP Addresses (IPv4) uses a 32-bit number to represent an IP address, and it defines both network and host address. Due to IPv4 addresses running out, a new version of the IP protocol (IPv6) has been invented to offer virtually limitless number of unique addresses. An IP address is written in "dotted decimal" notation, which is 4 sets of numbers separated by period each set representing 8-bit number ranging from (0-255). An example of IPv4 address is, which is the IP address assigned to topwebhosts.org.

An IPv4 address is divided into two parts: network and host address. The network address determines how many of the 32 bits are used for the network address, and remaining bits for the host address. The host address can further divided into subnetwork and host number.

Class A, B, C and CIDR networks

Traditionally IP network is classified as A, B or C network. The computers identified the class by the first 3 bits (A=000, B=100, C=110), while humans identify the class by first octet(8-bit) number. With scarcity of IP addresses, the class-based system has been replaced by Classless Inter-Domain Routing (CIDR) to more efficiently allocate IP addresses.

Class Network Address Number of Hosts Netmask
CIDR /4 240,435,456
CIDR /5 134,217,728
CIDR /6 67,108,864
CIDR /7 33,554,432
A /8 (1-126) 16,777,216
CIDR /9 8,388,608
CIDR /10 4,194,304
CIDR /11 2,097,152
CIDR /12 1,048,576
CIDR /13 524,288
CIDR /14 262,144
CIDR /15 131,072
B /16 (128-191) 65,534
CIDR /17 32,768
CIDR /18 16,384
CIDR /19 8,192
CIDR /20 4,096
CIDR /21 2,048
CIDR /22 1,024
CIDR /23 512
C /24 (192-223) 256
CIDR /25 128
CIDR /26 64
CIDR /27 32
CIDR /28 16
CIDR /29 8
CIDR /30 4

Note: (1) 127 Network Address reserved for loopback test. (2) Class D (224-247, Multicast) and Class E (248-255, Experimental) are not intended to be used in public operation.

Public and Private IP Addresses

In order to maintain uniqueness within global namespace, the IP addresses are publicly registered with the Network Information Center (NIC) to avoid address conflicts. Devices that need to be publicly identified such as web or mail servers must have a globally unique IP address, and they are assigned a public IP address. Devices that do not require public access may be assigned a private IP address, and make it uniquely identifiable within one organization. For example, a network printer may be assigned a private IP address to prevent the world from printing from it. To allow organizations to freely assign private IP addresses, the NIC has reserved certain address blocks for private use. A private network is a network that uses RFC 1918 IP address space. The following IP blocks are reserved for private IP addresses.

Class Starting IP Address Ending IP Address

In addition to above classful private addresses, through addresses are reserved for Zeroconf (or APIPA, Automatic Private IP Addressing) to automatically create the usable IP network without configuration.

What is loopback IP address?

The loopback IP address is the address used to access itself. The IPv4 designated as the loopback address with the subnet mask. A loopback interface is also known as a virtual IP, which does not associate with hardware interface. On Linux systems, the loopback interface is commonly called lo or lo0. The corresponding hostname for this interface is called localhost.

The loopback address is used to test network software without physically installing a Network Interface Card (NIC), and without having to physically connect the machine to a TCP/IP network. A good example of this is to access the web server running on itself by using or http://localhost.