Germany • NPA 231
☎️ Central Office Exchange (NXX)
+49 (231) 858 Exchange Code
Technical registry directory for telephone subscriber numbers starting with +49 (231) 858. Central office block assigned to Dortmund, Germany.
Standard Subscriber Format
+49 (231) 858-XXXX
Telecom Carrier
Local Network Carrier
Area Code (NPA)
231
Primary Location
Dortmund
Service Type
Landline
📋 Central Office Exchange 858 Routing Details
The 858 exchange code (central office prefix) operates within the 231 Numbering Plan Area (NPA) servicing Dortmund, Germany. All assigned subscriber lines in this block follow ITU-T E.164 national routing protocols.
Telecommunication services within the +49 (231) 858 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
0231 858-1234or local national format. -
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International Calls: Dial
+49 231 858-1234from outside Germany. -
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E.164 Standard:
+49231858XXXX
📞 Nearby Exchanges in Area Code 231
View All Area Code 231 Exchanges ›❓ Frequently Asked Questions
What area code is +49 (231) 858?
Phone numbers starting with +49 (231) 858 belong to the 231 area code in Dortmund, Germany, routed via exchange block 858.
How do I call a 858 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 231, and the subscriber number.
Which provider operates the 858 prefix in Dortmund?
Telecom services for the 858 exchange block in Dortmund are primarily assigned to Local Network Carrier for Landline connections.