[th]Sn no [/th]    [th]Country Name[/th]    [th]Capital city[/th]    [th]Dialing code[/th]
1	Somalia	Mogadishu	+252

There are only 195 country in the world as per current data of 2024, I'm not sure even old atlas mentioned 252, probably you confused on overall country or dialing code of a country ?