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CIDR/Netmask Lookup Tool

The CIDR/Netmask tool provides information about a CIDR range including the IP addresses and host addresses contained in it.

Enter an IPv4 or IPv6 address with optional CIDR notation, or just CIDR notation:
/22
Start IP:  10.248.128.0
End IP:  10.248.131.255
Addresses:  1024
Class:  4 Class C
Netmask:  255.255.252.0.
Binary:  11111111 11111111 11111100 00000000
/23
Start IP:  10.248.128.0
End IP:  10.248.129.255
Addresses:  512
Class:  2 Class C
Netmask:  255.255.254.0.
Binary:  11111111 11111111 11111110 00000000
/24
Start IP:  10.248.128.0
End IP:  10.248.128.255
Addresses:  256
Class:  Class C
Netmask:  255.255.255.0.
Binary:  11111111 11111111 11111111 00000000
/25
Start IP:  10.248.128.0
End IP:  10.248.128.127
Addresses:  128
Class:  -
Netmask:  255.255.255.128.
Binary:  11111111 11111111 11111111 10000000
/26
Start IP:  10.248.128.0
End IP:  10.248.128.63
Addresses:  64
Class:  -
Netmask:  255.255.255.192.
Binary:  11111111 11111111 11111111 11000000
/27
Start IP:  10.248.128.0
End IP:  10.248.128.31
Addresses:  32
Class:  -
Netmask:  255.255.255.224.
Binary:  11111111 11111111 11111111 11100000
/28
Start IP:  10.248.128.0
End IP:  10.248.128.15
Addresses:  16
Class:  -
Netmask:  255.255.255.240.
Binary:  11111111 11111111 11111111 11110000
/29
Start IP:  10.248.128.0
End IP:  10.248.128.7
Addresses:  8
Class:  -
Netmask:  255.255.255.248.
Binary:  11111111 11111111 11111111 11111000
/30
Start IP:  10.248.128.0
End IP:  10.248.128.3
Addresses:  4
Class:  -
Netmask:  255.255.255.252.
Binary:  11111111 11111111 11111111 11111100
/31
Start IP:  10.248.128.0
End IP:  10.248.128.1
Addresses:  2
Class:  -
Netmask:  255.255.255.254.
Binary:  11111111 11111111 11111111 11111110
/32
Start IP:  10.248.128.0
End IP:  10.248.128.0
Addresses:  1
Class:  -
Netmask:  255.255.255.255.
Binary:  11111111 11111111 11111111 11111111