You can search for telephone and fax numbers, E-mail address, building and office numbers of individual persons or services at CERN. Please type the known information into the search field and press Enter or click on the Find button.

Useful Numbers

Central telephone exchange:	+41 22 76 761 11
Central Fax:	+41 22 76 765 55
Reception desk:	+41 22 76 766 49
Visit's Reception desk:	+41 22 76 784 84

CERN internal telephone numbers

These are five-digit numbers, all reachable directly from outside CERN.

Example: to call internal number xxxxx from a telephone in Belgium, dial 00 (to get out of Belgium) then 41 (country code for Switzerland) then 22 (area code for Geneva) then 76 (the first two digits of all CERN telephones) and finally xxxxx. Note that not all countries use 00 to dial internationally.

CERN GSM numbers (mobile phones)

These are of the form 16xxxx.

To call a CERN GSM from outside CERN, dial as if you were calling the Swiss number (76) 487 and the last 4 digits of the GSM number. Example: to call GSM 161234 from the USA, dial 011 41 76 487 1234.

Remote Conferencing

Audio Conference

Video Conference

Updating information

Note that this can only be done by authorised personnel. See the corresponding administrative procedure. If the information concerning your Group or Department is incorrect, contact your Secretariat.

Telephone Robots

When dialing from within CERN and ending up in an external company's robot, you may be asked to select a service by pressing certain digits. This will fail unless you press 98 before the digit. Example: "to contact customer service, press 2" should be reacted to by pressing 982 and not just 2.

National Phone Directories

We provide a list of National Phone Directories for your convenience.

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Phone and E-mail Directory

How to find a CERN telephone or fax number or an email address