Default fields and field lengths in MySQL

There are several fields that are common sense to use with a given standard. The W3C and some other has its recommendations, but the advice on this site are comprehensive. I have made an easy overview that I have made that suits my purposes.

I just quried my databases with thousands of customers in Norway and checked with checked with other people’s recommendations.
This is what I found:

Name of field	Min	Max
The maximum first name length was 46. I go with 50.	2	50
Last name was similar to first name: 50.	2	50
Full name is sum of the above	4	100
2 x Street address maxes out at 95 characters. The long ones were all valid. I always use to address field.	0	100
Postal Code (https://en.wikipedia.org/wiki/List_of_postal_codes. Use max 12 if storing dash or space)	2	11
Telephone Number	3	15
Email Address	7	254
IP Address (incl ipv6)	7	45
Hostname	1	255
Domain Name	4	253
HTTP(S) URL w domain name	6	2083
Longitude	numeric	9, 6
Latitude	numeric	8, 6
Money	numeric	19, 4