China • NPA 511
☎️ Central Office Exchange (NXX)
+86 (511) 621 Exchange Code
Technical registry directory for telephone subscriber numbers starting with +86 (511) 621. Central office block assigned to Zhenjiang, Jiangsu, China.
Standard Subscriber Format
+86 (511) 621-XXXX
Telecom Carrier
Local Network Carrier
Area Code (NPA)
511
Primary Location
Zhenjiang, Jiangsu
Service Type
Landline
📋 Central Office Exchange 621 Routing Details
The 621 exchange code (central office prefix) operates within the 511 Numbering Plan Area (NPA) servicing Zhenjiang, Jiangsu, China. All assigned subscriber lines in this block follow ITU-T E.164 national routing protocols.
Telecommunication services within the +86 (511) 621 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
0511 621-1234or local national format. -
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International Calls: Dial
+86 511 621-1234from outside China. -
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E.164 Standard:
+86511621XXXX
📞 Nearby Exchanges in Area Code 511
View All Area Code 511 Exchanges ›❓ Frequently Asked Questions
What area code is +86 (511) 621?
Phone numbers starting with +86 (511) 621 belong to the 511 area code in Zhenjiang, Jiangsu, China, routed via exchange block 621.
How do I call a 621 exchange number from abroad?
To call this prefix internationally, dial your local exit code (e.g., 011 in North America or + globally), followed by +86, then 511, and the subscriber number.
Which provider operates the 621 prefix in Zhenjiang, Jiangsu?
Telecom services for the 621 exchange block in Zhenjiang, Jiangsu are primarily assigned to Local Network Carrier for Landline connections.