IPv4 SUBNET

Calculator · Subnetter · Wildcard
← Network Tools
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32-bit mask map

Network Host
Octet 1
Octet 2
Octet 3
Octet 4
. . .
/
Split by
Number of subnets
each will be /26
New prefix
/ generates 4 subnets of 62 hosts
Hosts per subnet
prefix /26, 4 subnets
Subnet mask
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Tip: editing the prefix auto-updates the mask fields, and vice versa.

Subnet mask
255.255.255.0
11111111.11111111.11111111.00000000
⇄
Wildcard mask
0.0.0.255
00000000.00000000.00000000.11111111
/24
Usage examples
Cisco IOS — Standard ACL Permit or deny the entire network block
! Standard ACL
access-list 10 permit 192.168.1.0 0.0.0.255

! Extended ACL
ip access-list extended ALLOW_NET
 permit ip 192.168.1.0 0.0.0.255 any
OSPF — Area advertisement Include the network in the OSPF process
router ospf 1
 network 192.168.1.0 0.0.0.255 area 0
 network 192.168.1.0 0.0.0.255 area 1