# How would I add 0.0.15.255. to 172.1.6.255.? [closed]

How would I add 0.0.15.255 to 172.1.6.255, talking about IPv4 networks here. I have done things like 192.168.1.15 plus 0.0.1.30 to be 192.168.2.45. but when it goes over the limit of 255, I just do not now how to do this... Help?

This is the what I am assigned to do:

I am given the block of adresses 172.16.0.0. and am told to design a scheme/ diagram of an adressing of the following given network, using basic subnetting:

1.HQ Lan (500 hosts) 2.West Lan(400 hosts) 3. East Lan (400 hosts)... .... ... .. 15. WAN 8 (2 hosts)

So the assignment is done like $2^p\geq15 \implies p=4$ So, since the default subnet for our given adress is $/ 16 + /p= /20\implies 12$ bits are left for hosts.(meaning 12 $1's$ to add to an adress to get the broadcast..)$2^{12}-2 > 500,$(because of HQ Lan , with the most number of hosts..) therefore subnetting is possible. Then it says that the IP of the subnetworks are as follows (with broadcast adresses.)

$$1. \text{HQ Lan:} \ \ 172.16.0.0. \ \ \text{ Broadcast adress: } \ \ 172.16.15.255. \\ 2.\text{West Lan:} \ \ 172.16.16.0. \ \ \text{ Broadcast adress: } \ \ 172.16.31.255. \\ 3. \text{East Lan:} \ \ 172.16.32.0. \ \ \text{ Broadcast adress: } \ \ 172.47.255.255. \\ ... \\ 15. \text{WAN 8:} \ \ 172.16.224.0. \ \ \text{ Broadcast adress: } \ \ 172.16.239.255.$$

I can assume from this context one can deduct can deduct from what I mean by "add". If I had the example: $$\text{Example LAN:172.1.6.255. } \text{ Subnetmask: ???}$$ I would have to add by $0.0.15.255.$

## closed as off-topic by David Richerby, Tom van der Zanden, Kyle Jones, Evil, vonbrandDec 22 '15 at 0:26

This question appears to be off-topic. The users who voted to close gave this specific reason:

• "This question does not appear to be about computer science, within the scope defined in the help center." – David Richerby, Kyle Jones, Evil
If this question can be reworded to fit the rules in the help center, please edit the question.

• 1. What does this have to do with computer science? Looks like network engineering to me. 2. How do you get “Example LAN:172.1.6.255”? Why do you want to add something to it? Do you understand what a netmask is (if not, start by reading about that)? – Gilles Dec 21 '15 at 19:52
• You wouldn't. Adding IP addresses makes no more sense than adding street addresses or telephone numbers. – David Richerby Dec 21 '15 at 20:02
• No one understands me !! – Bozo Vulicevic Dec 21 '15 at 20:05
• Please don't make edits that deface your question. – D.W. Dec 21 '15 at 20:13
• 0.0.15.255 is not a number of hosts, or a broadcast address either, and it has no apparent relationship with the IP addresses you've listed. Your question doesn't make sense. – user207421 Dec 21 '15 at 21:45