Taking into consideration the missile with maximum range in each country's arsenal, here is the world top 5:

1. RUSSIA - 16,000 km (R-36)
2. CHINA - 15,000 km (DF-41)
3. USA - 13,000 km (Minuteman III)
4. UK - 12,000 km (Trident D5)
5. NORTH KOREA - 10,400 km (Hwasong-13)
6. France - 8,000 km
7. Israel - 6,500 km
8. India - 5,000 km
9. Iran - 3,000 km
10. Pakistan - 2,000 km

Counting only with its own territory to launch missiles, only the Russian Federation can, in theory, hit all countries on Earth.

If colonies are included in the list of locations for a possible launching, there are 4 countries theoretically able to hit all countries on Earth:

• Russia
• USA
• France
• UK

China, even without colonies, is not far behind. For now, only Argentina, Uruguay, Paraguay, and Chile are out of Chinese missiles' range:

If North Korea successfully develops its Hwasong-15, this nation will join the US in the 3rd place of this ranking. By then, only South American and a few South African nations will be out of reach from North Korean missiles.

EXTRA - Rocket Projector Strength by Country (quantity)

Sources:

• https://missilethreat.csis.org/missile/ 
• https://www.nytimes.com/interactive/2018/02/07/world/asia/north-korea-missile-proliferation-range-intercontinental-iran-pakistan-india.html 
• https://www.globalfirepower.com/aircraft-total.php