Romania • NPA 21
☎️ Central Office Exchange (NXX)
+40 (21) 531 Exchange Code
Technical registry directory for telephone subscriber numbers starting with +40 (21) 531. Central office block assigned to Bucharest and Ilfov County, Romania.
Standard Subscriber Format
+40 (21) 531-XXXX
Telecom Carrier
Local Network Carrier
Area Code (NPA)
21
Primary Location
Bucharest and Ilfov County
Service Type
Landline
📋 Central Office Exchange 531 Routing Details
The 531 exchange code (central office prefix) operates within the 21 Numbering Plan Area (NPA) servicing Bucharest and Ilfov County, Romania. All assigned subscriber lines in this block follow ITU-T E.164 national routing protocols.
Telecommunication services within the +40 (21) 531 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
021 531-1234or local national format. -
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International Calls: Dial
+40 21 531-1234from outside Romania. -
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E.164 Standard:
+4021531XXXX
📞 Nearby Exchanges in Area Code 21
View All Area Code 21 Exchanges ›❓ Frequently Asked Questions
What area code is +40 (21) 531?
Phone numbers starting with +40 (21) 531 belong to the 21 area code in Bucharest and Ilfov County, Romania, routed via exchange block 531.
How do I call a 531 exchange number from abroad?
To call this prefix internationally, dial your local exit code (e.g., 011 in North America or + globally), followed by +40, then 21, and the subscriber number.
Which provider operates the 531 prefix in Bucharest and Ilfov County?
Telecom services for the 531 exchange block in Bucharest and Ilfov County are primarily assigned to Local Network Carrier for Landline connections.