Prefix overview
Phone numbers in prefix 563-550
This page covers the 563-550 prefix in the United States. It shows where numbers come from, which carrier is linked to the range, and how this block is structured.
If you are looking for a specific number, you can continue to its dedicated phone page. Otherwise, this page helps you understand the broader number block behind it.
PREFIX
563-550
RATE CENTER
CALMAR
CARRIER
ONVOY SPECTRUM, LLC
IA
Prefix range
The prefix 563-550 includes numbers from 5635500000 to 5635509999.
This range is associated with the CALMAR rate center and was originally assigned to ONVOY SPECTRUM, LLC.
Numbers in this prefix
20 numbers