Wildcard mask itu dipakai untuk “membebaskan” bit tertentu (umum di ACL). Ini ringkasan wildcards IP yang paling sering dipakai, plus contoh pemakaiannya.
Wildcard mask umum (IPv4)
| Kebutuhan | Netmask | Wildcard |
|---|---|---|
| 1 host (exact) | /32 = 255.255.255.255 | 0.0.0.0 |
| 2 host (p2p) | /31 = 255.255.255.254 | 0.0.0.1 |
| 4 IP | /30 = 255.255.255.252 | 0.0.0.3 |
| 8 IP | /29 = 255.255.255.248 | 0.0.0.7 |
| 16 IP | /28 = 255.255.255.240 | 0.0.0.15 |
| 32 IP | /27 = 255.255.255.224 | 0.0.0.31 |
| 64 IP | /26 = 255.255.255.192 | 0.0.0.63 |
| 128 IP | /25 = 255.255.255.128 | 0.0.0.127 |
| 1 subnet /24 | /24 = 255.255.255.0 | 0.0.0.255 |
| 2 subnet (/23) | /23 = 255.255.254.0 | 0.0.1.255 |
| 4 subnet (/22) | /22 = 255.255.252.0 | 0.0.3.255 |
| 8 subnet (/21) | /21 = 255.255.248.0 | 0.0.7.255 |
| 16 subnet (/20) | /20 = 255.255.240.0 | 0.0.15.255 |
| 1 “Class B” (/16) | /16 = 255.255.0.0 | 0.0.255.255 |
| 1 “Class A” (/8) | /8 = 255.0.0.0 | 0.255.255.255 |
Rumus cepat: wildcard = 255.255.255.255 - netmask
Contoh (Cisco ACL style)
-
Host tertentu
192.168.10.5192.168.10.5 0.0.0.0 -
Satu subnet /24
192.168.10.0/24192.168.10.0 0.0.0.255 -
Range 192.168.10.0–192.168.11.255 (/23)
192.168.10.0 0.0.1.255