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Home/ Questions/Q 633905
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T20:14:11+00:00 2026-05-13T20:14:11+00:00

I have an IPaddress and subnet mask, both in unsigned long; how can I

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I have an IPaddress and subnet mask, both in unsigned long; how can I AND both of these and check whether my incoming ipaddress (ip2) belongs to the same subnet or not?

like:

if (ip1 & subnet == ip2 & subnet)
    then same subnet.  
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  1. Editorial Team
    Editorial Team
    2026-05-13T20:14:11+00:00Added an answer on May 13, 2026 at 8:14 pm

    Use parentheses – the precedence levels are confusing:

    if ((ip1 & subnet) == (ip2 & subnet))
        ...
    

    The original code was effectively the same as:

    if (ip1 & (subnet == ip2) & subnet)
        ...
    
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