Find IP Subnet Mask


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  Numbering system

An IP address uniquely identifies every host on a network. TCP/IP looks at IP addresses in binary form, but as humans, we prefer to see IP addresses in decimal form. Because the protocol is seeing only binary, working with IP addresses makes more sense when you also look at the IP addresses in binary.
  • binary
    The base-2 number system that computers use to represent data. It consists of only two digits: 0 and 1.
  • decimal
    The base-10 number system that people use to represent data. It consists of 10 digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
  checkpoint


Converting Binary Numbers to Decimal

Converting binary to decimal and decimal to binary is an important skil. Network administrator will know the exact values that TCP/IP uses. Converting
  1. binary number 0001 - The decimal equation for the conversion is 0 + 0 + 0 + 1 = 1 decimal
  2. binary number 0110 - The decimal equation for the conversion is 0 + 4 + 2 + 0 = 6 decimal
  3. binary number 1110 - The decimal equation for the conversion is 8 + 4 + 2 + 0 = 14 decimal
  4. binary number 1111 - The decimal equation for the conversion is 8 + 4 + 2 + 1 = 15 decimal
Each of these columns represents a bit (binary digit). The greatest decimal number that can be represented by number 4 bits is 15.  
protocols
 
IP address >> IP Subnet Mask
 
 
 
 
 

IP Subnet Mask

IP Address Calculator calculates and find IP Subnet Mask on basis from given IP Address. If second netmask for subnet is given then you will find IP subnet mask and get the results displayed in binary values.


IP Subnet Mask Color legend:
  1. blue - IP Address (alias "dotted quad" = number consist of four parts seperated by dot e.g. 127.0.0.1)
  2. green - subnet bits (Classes)
  3. red - netmask
  4. magenta - classbits
  5. yellow - binary
  6. black - standard
 
 
To find IP subnet mask from given IP ranges please check out our IP Subnet Mask Calculator
Note:
  • To prevent server resources we have limited number of Subnets to 100.
  • We do not check on the correctness of the IP or subnet mask combination.
  • First bits (see green bits color) will decide your network class and private network IP addresses (according to RFC 1918) are remarked.
Special thanks to Krischan Jodies for IP Subnet Mask calculator script.
 
 
 
 
IP Address (Host or Network)
/
Netmask (i.e. 24)
Netmask for subnet/supernet (optional)
 



 No host given
 No netmask given (using default netmask of your network's class)

Bla
Address:     169.254.0.0           10101001.11111110. 00000000.00000000
Netmask: 255.255.0.0 = 16 11111111.11111111. 00000000.00000000
Wildcard: 0.0.255.255 00000000.00000000. 11111111.11111111
=>
Network:     169.254.0.0/16        10101001.11111110. 00000000.00000000
HostMin: 169.254.0.1 10101001.11111110. 00000000.00000001
HostMax: 169.254.255.254 10101001.11111110. 11111111.11111110
Broadcast: 169.254.255.255 10101001.11111110. 11111111.11111111
Hosts/Net: 65534 Class B, APIPA
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