Germany • NPA 203
☎️ Central Office Exchange (NXX)
+49 (203) 623 Exchange Code
Technical registry directory for telephone subscriber numbers starting with +49 (203) 623. Central office block assigned to Duisburg, Germany.
Standard Subscriber Format
+49 (203) 623-XXXX
Telecom Carrier
Local Network Carrier
Area Code (NPA)
203
Primary Location
Duisburg
Service Type
Landline
📋 Central Office Exchange 623 Routing Details
The 623 exchange code (central office prefix) operates within the 203 Numbering Plan Area (NPA) servicing Duisburg, Germany. All assigned subscriber lines in this block follow ITU-T E.164 national routing protocols.
Telecommunication services within the +49 (203) 623 prefix range are primarily provisioned by Local Network Carrier, delivering local landline voice lines and network routing.
🌐 Dialing Instructions
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Domestic Calls: Dial
0203 623-1234or local national format. -
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International Calls: Dial
+49 203 623-1234from outside Germany. -
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E.164 Standard:
+49203623XXXX
📞 Nearby Exchanges in Area Code 203
View All Area Code 203 Exchanges ›❓ Frequently Asked Questions
What area code is +49 (203) 623?
Phone numbers starting with +49 (203) 623 belong to the 203 area code in Duisburg, Germany, routed via exchange block 623.
How do I call a 623 exchange number from abroad?
To call this prefix internationally, dial your local exit code (e.g., 011 in North America or + globally), followed by +49, then 203, and the subscriber number.
Which provider operates the 623 prefix in Duisburg?
Telecom services for the 623 exchange block in Duisburg are primarily assigned to Local Network Carrier for Landline connections.