What is a country dialing code?

A country dialing code (also called a country calling code or international dial prefix) is the numerical prefix defined by the ITU-T E.164 standard that routes a telephone call to the correct country. You dial it after your own country's exit code and before the national subscriber number. For example, +44 routes to the United Kingdom and +91 routes to India.

What is the trunk prefix and why do I drop it?

Many countries use a trunk prefix (commonly 0 or 8) at the start of local numbers to indicate long-distance routing within the country. When you dial internationally, the country code replaces this function, so the trunk digit is dropped. For example, a UK mobile 07911 123456 becomes +44 7911 123456 internationally.

Why do the USA, Canada and several Caribbean countries all share +1?

They are part of the North American Numbering Plan (NANP), a single dialing scheme that predates the modern ITU code framework. Individual territories are distinguished by their three-digit area codes — 212 for New York, 416 for Toronto, 876 for Jamaica — not by separate country codes.

What is the difference between +7 for Russia and +7 for Kazakhstan?

Both countries were assigned code 7 under the old Soviet-era numbering plan, which they retained after independence. Russian numbers follow one set of area codes while Kazakhstani numbers use a distinct set (e.g. 70x, 71x, 72x prefixes), so the code is shared but the national numbers do not clash.

What is the exit code and when do I use it?

The exit code (also called the international access code) is what you dial first to leave your own country's telephone network. Most countries use 00; the USA, Canada and parts of the Caribbean use 011; Russia uses 8, then a tone, then 10. On mobile phones, the plus sign (+) substitutes for any exit code, which is why storing numbers in +CountryCode format works everywhere.

Is this tool accurate for all mobile and geographic numbers?

The national subscriber number lengths shown are indicative. Some countries have both shorter and longer numbers for different services (freephone, premium-rate, satellite). The converter strips the listed trunk prefix and prepends the country code, which is correct for the vast majority of standard mobile and fixed-line numbers.

Country Dialing Code Lookup

A fast, fully offline tool for looking up the international dialing code (country calling code) for any of the 130+ countries in the embedded database. Search by country name, two-letter ISO code, or the code digits themselves, and the result shows everything you need to dial internationally: the ITU-T E.164 prefix, the national trunk digit to drop, the exit code used from that country, a worked example local number, and which other territories share the same code.

The built-in converter at the bottom of each result card turns a local number into proper international format in one step — paste the local number (with or without the trunk prefix) and the tool strips the trunk digit and prepends the country code for you.

How it works

International telephony is governed by the ITU-T E.164 standard, which assigns each country (or territory) a numeric prefix of one to three digits. To construct a full international number you combine three parts:

Exit code — tells your local network you are dialing internationally (e.g. 00, 011, or + on a mobile)
Country code — routes the call to the destination country (e.g. 44 for the UK)
National subscriber number — routes within that country, usually with the leading trunk digit removed

The formula as a diagram:

[Exit code] + [Country code] + [National number minus trunk prefix]
     00      +      44        +         7911 123456
                         = 0044 7911 123456  (or +44 7911 123456 on a mobile)

This page ships the entire 130-country lookup table as JavaScript bundled with the page, so every search and every conversion runs entirely in your browser — no request ever leaves your device.

Worked example

Goal: dial a French mobile 06 12 34 56 78 from the United Kingdom.

Step	Value	Notes
France dialing code	+33	Found by searching “France” or “FR” or “33”
French trunk prefix	0	Drop the leading 0 from the local number
National number	6 12 34 56 78	Local number with trunk digit removed
UK exit code (mobile)	+	Plus sign on any mobile replaces the exit code
Full international number	+33 6 12 34 56 78	Ready to dial or save in contacts

Using the converter below the France result: paste 06 12 34 56 78 and the tool outputs +33 612345678 ready to copy. You can then format it with spaces as you prefer.

Notes on shared codes

A small number of codes are assigned to more than one territory:

+1 covers the entire North American Numbering Plan: the United States, Canada, and around 20 Caribbean island nations. Individual territories are distinguished by their three-digit area code (212 = New York, 416 = Toronto, 876 = Jamaica).
+7 is shared by Russia and Kazakhstan, a legacy of the Soviet-era unified telephone network. Russian area codes and Kazakhstani area codes do not overlap.
+44 belongs exclusively to the United Kingdom (England, Scotland, Wales and Northern Ireland). The Crown Dependencies (Jersey, Guernsey, Isle of Man) use +44 but have their own geographic area codes.

When the lookup tool finds a shared code, the result card notes the other territories that share it, so you can verify you have the right one.

Formula note

The conversion from local to international format is:

international = countryCode + nationalNumber.replace(leadingTrunkPrefix, "")

where nationalNumber is the local number with all spaces and hyphens stripped before the trunk check. The tool applies this formula client-side using the trunk prefix listed for each country (e.g. "0" for the UK, "8" for Russia).