CODEWITHSUNDEEP
c++formatip-address
Niko Gamulin
Niko Gamulin

Reputation: 66555

How to convert standard IP address format string to hex and long?

Does anyone know how to get the IP address in decimal or hex from standard IP address format string ("xxx.xxx.xxx.xxx")?

I've tried to use the inet_addr() function but didn't get the right result.

I tested it on "84.52.184.224"

the function returned 3770168404 which is not correct (the correct result is 1412741344).

Thanks!

Upvotes: 5

Views: 27974

Answers (5)

Paul Dixon
Paul Dixon

Reputation: 300825

You have just got the bytes reversed from what you expected - they are in network byte order

3770168404 = 0xE0 B8 34 54     network byte order
               |         |
                \       /
                 \     /
                  \   /
                   \ /
                   /\
                  /  \   
                 /    \
                /      \
               |        |
1412741344 = 0x54 34 B8 E0     machine order

You could use ntohl() convert from network order to machine order.

Upvotes: 25

Nehal
Nehal

Reputation:

Carefully check the below link:

http : // msdn.microsoft.com/en-us/library/ms738563(VS.85).aspx

Upvotes: 0

Jackson
Jackson

Reputation: 5657

The htonl, htons, ntohl, ntohs functions can be used to convert between network and local byte orders.

Upvotes: 9

soulmerge
soulmerge

Reputation: 75704

The returned result is correct, the bytes are ordered in network byte order

84 => 0x54
52 => 0x34
184 => 0xb8
224 => 0xe0
0xe0b83454 => 3770168404

Upvotes: 4

John Stauffer
John Stauffer

Reputation: 16360

I think you may be running into a byte order issue. From the man page:

All Internet addresses are returned in network order (bytes ordered from left to right). All network numbers and local address parts are returned as machine byte order integer values.

Upvotes: 2

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