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The network IP address allocated to a network administrator is 172.31.0.0/20.

Which portion of the address is the network, which part is the host and which is the subnet mask?
n = network
s = subnet
h = host

nnnnnnnn.nnnnnnnn.nnnnssss.hhhhhhhh

would that bet correct?

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Last Post by bob2
1

This might help also:

ID	# Bits	Number Hosts	Usable Hosts	Netmask		Note
6	/6  	67108864	67108862	 252.0.0.0  	
7	/7 	33554432	33554430	254.0.0.0 	
8	/8 	16777216	16777214	255.0.0.0 	Class A Network 
9	/9 	8388608		8388606		255.128.0.0 	
10	/10 	4194304		4194302		255.192.0.0 	
11	/11 	2097152		2097150		255.224.0.0 	
12	/12 	1048576		1048574		255.240.0.0 	
13	/13 	524288		524286		255.248.0.0 	
14	/14 	262144		262142		255.252.0.0 	
15	/15 	131072		131070		255.254.0.0 	
16	/16 	65536		65534		255.255.0.0 	Class B Network 
17	/17 	32768		32766		255.255.128.0 	
18	/18 	16384		16382		255.255.192.0 	
19	/19 	8192		8190		255.255.224.0 	
20	/20 	4096		4094		255.255.240.0 	
21	/21 	2048		2046		255.255.248.0 	
22	/22 	1024		1022		255.255.252.0 	
23	/23 	512		510		255.255.254.0 	
24	/24 	256		254		255.255.255.0 	Class C Network 
25	/25 	128		126		255.255.255.128 	
26	/26 	64		62		255.255.255.192 	
28	/28	16		14		255.255.255.240	
27	/27	32		30		255.255.255.224	
29	/29 	8		6		255.255.255.248 	
30	/30 	4		2		255.255.255.252
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Hi Bangor_boy.
The classful network is 172.31.0.0/16.The network you have is already subnetted and that's why it's 172.31.0.0/20 which will actually give you 16 subnets since 4 bits have been borrowed from the host bits of the /16 network. The 16 subnets are 172.31.0.0/20,172.31.16.0 up-to 172.31.240.0/20(note that it's a 16 jump). Each of the 16 subnets will have 4096 hosts.
So it should be nnnnnnnn.nnnnnnnn.sssshhhh.hhhhhhhh.
Hope this will help and also that you've learnt something more.

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Would this be the same using subnet 0 as i've worked my way through a few questions and then seen i should be using this and im confused again

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I.P subnet zero is usable by default on Cisco Routers and I believe also on Juniper routers. So you can use it.

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