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It is a valid network number. &nbsp;Routers aren't going to treat it any differently than any other network number. &nbsp;Unless of course, it recognizes the network:)
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It is a valid network number.  Routers aren't going to treat it any differently than any other network number.  Unless of course, it recognizes the network:)

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Close, while it is a subnet zero is a valid network, Cisco routers will certainly not allow you to assign an interface to the &quot;zeroth&quot; network unless you've included &quot;ip subnet-zero&quot; in your router config. Other than that RobWMartin's statement is correct, routers and switches will allow the use of subnet zero.
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Close, while it is a subnet zero is a valid network, Cisco routers will certainly not allow you to assign an interface to the "zeroth" network unless you've included "ip subnet-zero" in your router config. Other than that RobWMartin's statement is correct, routers and switches will allow the use of subnet zero.

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Key word is &quot;historically&quot; - you answered your own question!!!
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Key word is "historically" - you answered your own question!!!

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I'm resubnetting a class B network (call it 129.1.x.x). With a mask of 255.255.240.0, the first usable range is 129.1.0.1 thru 129.1.15.255 (4094 hosts).<br />
<br />
Historically this range has been considered the &quot;zero&quot; network, and not to be used. Does this mean is CAN'T be used, SHOULDN'T be used, or it's now OK to use.<br />
<br />
Thanks
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I'm resubnetting a class B network (call it 129.1.x.x). With a mask of 255.255.240.0, the first usable range is 129.1.0.1 thru 129.1.15.255 (4094 hosts).

Historically this range has been considered the "zero" network, and not to be used. Does this mean is CAN'T be used, SHOULDN'T be used, or it's now OK to use.

Thanks

IP subnetting, okay to use the &quot;zero&quot; subnet?

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

IP subnetting, okay to use the &quot;zero&quot; subnet?

IP subnetting, okay to use the "zero" subnet?