Wildcard / ACL Builder

Enter a CIDR to get the wildcard mask plus paste-ready Cisco ACL, prefix-list and OSPF/EIGRP network … area lines — or reverse a wildcard to see exactly which bits it matches (including non-contiguous odd/even masks).

network (CIDR)

Network

10.1.2.0

Wildcard mask

0.0.0.255

Subnet mask

255.255.255.0

Prefix

/24

Match exactly

24 bits

Wildcarded

8 bits

// bit decompositionmust match (24)wildcard / any (8)boundary at /24

00001010

00000001

00000010

00000000

Standard ACL

access-list 10 permit 10.1.2.0 0.0.0.255

Extended ACL

access-list 100 permit ip 10.1.2.0 0.0.0.255 any

Named ACL

ip access-list standard FROM-NET
 permit 10.1.2.0 0.0.0.255

Prefix-list

ip prefix-list PL seq 5 permit 10.1.2.0/24

OSPF

network 10.1.2.0 0.0.0.255 area 0

EIGRP

network 10.1.2.0 0.0.0.255