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255.0.0.0

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Posted by burhanalipk

55.255.255.0

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Posted by waqasahmad

default subnet mask of 255.0.0.0.

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Posted by crouse

255.0.0.0

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Posted by HamidAliKhan

Class A IP addresses use the first 8 bits for network identification and the last 24 bits for host identification. The result is an IP address range from 0.0.0.0 through 127.255.255.255 and a default subnet mask of 255.0.0.0.

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Posted by Fangzhou