Location Detection

Implement a prototype service to detect a user's location based on their IP addresses.

The IP addresses belonging to the IPv

$4$

$$space are conventionally represented by four octets,

$"$

a

$.$

b

$.$

c

$.$

d

$"$

$-$

$$such as

$127\mathrm{.}10\mathrm{.}20\mathrm{.}30$

$.$

$$To keep it simple, these IP addresses are classified into

$5$

$$different regions indexed from

$1$

$$to

$5$

$$on the basis of the order of the bits in the first octet.