How many characters can an IP address be?
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Chapters
00:00 How Many Characters Can An Ip Address Be?
00:31 Accepted Answer Score 35
01:07 Answer 2 Score 3
02:12 Thank you
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Full question
https://superuser.com/questions/381022/h...
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Tags
#networking #ip #ipaddress
#avk47
ACCEPTED ANSWER
Score 35
An IPv6 address, at its longest, would be 8 sets of 4 characters (32 total), each set separated by a colon. That makes 39 characters.
An IPv4 address is at most 4 sets of 3 numbers (12 characters), each set separated by a dot (.). That makes 15 characters.
All of this assumes the IP addresses should be stored in human-readable form. I prefer to store IP addresses in decimal form, as you never quite know how it will be used. Your mileage may vary.
ANSWER 2
Score 3
This is not as easy as one might think.
In most cases your are safe with 45.
Normal IPv6 address
0000:0000:0000:0000:0000:0000:0000:0000
8 * 4 + 7 = 39
IPv4-mapped IPv6 address
See rfc4291
0000:0000:0000:0000:0000:ffff:192.168.100.228
(6 * 4 + 5) + 1 + (4 * 3 + 3) = 29 + 1 + 15 = 45
Header files define INET6_ADDRSTRLEN to be 46
IPv6 with scope zone
See rfc4007
Scope zone can be a number or even a string (interface name).
ff02::5678%5
ff08::9abc%interface10
The length of the interface name depends on the system. In Linux it is defined by the IFNAMSIZ constant. 16 is a common value. With the 45 chars from above:
45 + 1 + 16 = 62