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Web Network, IP Address, and Hex CalculatorsJanuary, 2009
Network and IP address (CIDR) calculatorThe netmask in "bits format" is also known as mask in CIDR format (CIDR=Classless Inter-Domain Routing). Output here equivalent to whatmask. Converters for Network and IP addressSubnet Mask Converter (dotted decimal to bits format)Subnet Mask Converter (bits format to dotted decimal)Number of required addresses to netmask converterConvert dotted decimal IP-address or mask to binary and hexConvert hex IP-address or mask dotted decimalCalculate the bit-complement of an IP-address (invert)Convert a Network Mask to amount of usable addresses
IP Multicast address rangesAll multicast addresses can easily be recognized because they start with the bit pattern "1110".
224.0.0.0 - 224.0.0.255 Well-known multicast addresses, control channels
Special and private address rangesPrivate address ranges are not routed on the Internet and can be freely allocated in any private network. NAT (network address translation) is required when connecting such a network to the Internet.
Private network addresses (RFC1597/RFC1918 addresses):
Overview of common subnets and masksMask Hosts Usable Netmask Hex Mask /30 4 2 255.255.255.252 fffffffc this is 1/64 of a Class C net /29 8 6 255.255.255.248 fffffff8 this is 1/32 of a Class C net /28 16 14 255.255.255.240 fffffff0 this is 1/16 of a Class C net /27 32 30 255.255.255.224 ffffffe0 this is 1/8 of a Class C net /26 64 62 255.255.255.192 ffffffc0 this is 1/4 of a Class C net /24 256 254 255.255.255.0 ffffff00 this is a Class C net /23 512 510 255.255.254.0 fffffe00 these are 2 Class C net /22 1024 1022 255.255.252.0 fffffc00 these are 4 Class C net /21 2048 2046 255.255.248.0 fffff800 these are 8 Class C net /20 4096 4094 255.255.240.0 fffff000 these are 16 Class C net /19 8192 8190 255.255.224.0 ffffe000 these are 32 Class C net /18 16384 16382 255.255.192.0 ffffc000 these are 64 Class C net /17 32768 32766 255.255.128.0 ffff8000 these are 128 Class C net /16 65536 65534 255.255.0.0 ffff0000 these are 256 Class C net = Class B net This page only requires a javascript capable web browser. © Guido Socher original, Version: 2008-09-14 |
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