Phone Prefix
(443) 503-XXXX
MD • DUNDALK
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Carrier Information
NANPA
State
MD
Region
MA
Rate Center
DUNDALK
Assigned To
MCIMETRO ACCESS TRANSMISSION SERVICES LLC
OCN
7229
Status
RT
Number Range
First Number
(443) 503-0000
Last Number
(443) 503-9999
This prefix contains 10,000 possible phone numbers
Spam Reports
11 reports
11
Total FCC + FTC DNC complaints for numbers in this prefix
Top 11 Most Reported Numbers
| # | Phone Number | Reports |
|---|---|---|
| 1 | (443) 503-0108 4435030108 | 1 |
| 2 | (443) 503-2015 4435032015 | 1 |
| 3 | (443) 503-2224 4435032224 | 1 |
| 4 | (443) 503-3153 4435033153 | 1 |
| 5 | (443) 503-3429 4435033429 | 1 |
| 6 | (443) 503-3473 4435033473 | 1 |
| 7 | (443) 503-3896 4435033896 | 1 |
| 8 | (443) 503-4060 4435034060 | 1 |
| 9 | (443) 503-5439 4435035439 | 1 |
| 10 | (443) 503-8645 4435038645 | 1 |
| 11 | (443) 503-8991 4435038991 | 1 |
About This Prefix
Phone numbers starting with (443) 503 are part of the North American Numbering Plan (NANP). The first three digits (443) represent the Area Code (NPA), and the next three digits (503) represent the Central Office Code (NXX) or exchange.
- NPA (443) - Numbering Plan Area, identifies the geographic region
- NXX (503) - Central Office Code, identifies the specific exchange
- XXXX - Subscriber number (0000-9999)