Systerms : Subnet Mask

& (1) | 2 (1) | A (13) | B (12) | C (18) | D (12) | E (5) | F (17) | G (16) | H (22) | I (15) | J (6) | K (5) | L (6) | M (28) | N (12) | O (3) | P (60) | Q (6) | R (46) | S (84) | T (22) | U (24) | V (15) | W (19) | X (3) | Y (3) | Z (3)

Defines which part of an IP address identifies the network and which part identifies the device.

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