Online Tools

Subnet Mask Calculator

Network & IP Calculator

Input IP . . . Mask Bits

Network & IP Calculator v2

Input IP . . . Network Type
Subnet IP Count Node/Host

Subnet Mask Converter (bits to decimal/hex)

Mask Bits

Calculate Mask from Host Count

Host Count Needed

Network/Node Calculator

Subnet Mask . . .
TCP/IP . . .

TCP/IP Base Converter

Decimal Dotted . . .
Binary . . .
Hexadecimal . . .
Decimal Single

Subnet Mask Reverse Calculator

Dotted Mask . . .

Mask to Available Address Count

Mask Bits

Decimal Mask to Bit Count

Dotted Mask . . .

IP Address Bit Complement

. . .

IP Multicast Address Range

All multicast addresses can be easily recognized because they start with the bit pattern "1110".

224.0.0.0 - 224.0.0.255 Well-known multicast addresses, control channels
224.0.1.0 - 238.255.255.255 Global scope (internet-wide) multicast addresses
239.0.0.0 - 239.255.255.255 Local multicast addresses