Calculate for IPv4:
185.237.121.9
Enter any domain name or IP address.
Internet Protocol Address:
IP address (classic):
185.237.121.9/255.255.255.0
IP address (integer):
3119347977
IP address (cisco):
185.237.121.9/24
IP value (binary):
11000000.10101000.00000000.00000001
Netmask (binary):
11111111.11111111.11111111.00000000
Network:
192.168.0.0/24
Network Class:
C
Total avail. IP:
256
Network address:
192.168.0.0
Broadcast address:
192.168.0.255
Wildcard Mask:
0.0.0.255
Convert IP addresses range to CIDR
Result:
Convert CIDR to IP addresses range
Result:
Convert IP to integer or integer to IP
Reserved IP classes
127.0.0.0/8 Loopback (the entire class A beginning with 127.)
10.0.0.0/8 Private (the entire class A beginning with 10.)
172.16.0.0/12 Private (16 contiguos Class B, from 172.16.0.0/16 through 172.31.0.0/16)
192.168.0.0/16 Private (256 contiguos Class C, from 192.168.0.0/24 through 192.168.255.0/24)
Overview of common subnets and masks
Netmask Netmask (binary) CIDR Notes
255.255.255.255 11111111.11111111.11111111.11111111 /32 Host (single addr)
255.255.255.254 11111111.11111111.11111111.11111110 /31 2 usable (RFC 3021)
255.255.255.252 11111111.11111111.11111111.11111100 /30 2 usable
255.255.255.248 11111111.11111111.11111111.11111000 /29 6 usable
255.255.255.240 11111111.11111111.11111111.11110000 /28 14 usable
255.255.255.224 11111111.11111111.11111111.11100000 /27 30 usable
255.255.255.192 11111111.11111111.11111111.11000000 /26 62 usable
255.255.255.128 11111111.11111111.11111111.10000000 /25 126 usable
255.255.255.0 11111111.11111111.11111111.00000000 /24 254 usable
255.255.254.0 11111111.11111111.11111110.00000000 /23 2 Class C's + 2
255.255.252.0 11111111.11111111.11111100.00000000 /22 4 Class C's + 6
255.255.248.0 11111111.11111111.11111000.00000000 /21 8 Class C's + 14
255.255.240.0 11111111.11111111.11110000.00000000 /20 16 Class C's + 30
255.255.224.0 11111111.11111111.11100000.00000000 /19 32 Class C's + 62
255.255.192.0 11111111.11111111.11000000.00000000 /18 64 Class C's + 126
255.255.128.0 11111111.11111111.10000000.00000000 /17 128 Class C's + 254 / 129
255.255.0.0 11111111.11111111.00000000.00000000 /16
255.254.0.0 11111111.11111110.00000000.00000000 /15 2 Class B's
255.252.0.0 11111111.11111100.00000000.00000000 /14 4 Class B's
255.248.0.0 11111111.11111000.00000000.00000000 /13 8 Class B's
255.240.0.0 11111111.11110000.00000000.00000000 /12 16 Class B's
255.224.0.0 11111111.11100000.00000000.00000000 /11 32 Class B's
255.192.0.0 11111111.11000000.00000000.00000000 /10 64 Class B's
255.128.0.0 11111111.10000000.00000000.00000000 /9 128 Class B's
255.0.0.0 11111111.00000000.00000000.00000000 /8
254.0.0.0 11111110.00000000.00000000.00000000 /7
252.0.0.0 11111100.00000000.00000000.00000000 /6
248.0.0.0 11111000.00000000.00000000.00000000 /5
240.0.0.0 11110000.00000000.00000000.00000000 /4
224.0.0.0 11100000.00000000.00000000.00000000 /3
192.0.0.0 11000000.00000000.00000000.00000000 /2
128.0.0.0 10000000.00000000.00000000.00000000 /1
0.0.0.0 00000000.00000000.00000000.00000000 /0 IP space
IP Multicast address ranges
All 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
224.0.1.0 - 238.255.255.255 Globally-scoped (Internet-wide) multicast addresses
239.0.0.0 - 239.255.255.255 Local multicast addresses