| Callsign | K4DXO |
| Radio Service | HV - Vanity |
| License Status | A - Active |
| Grant Date | 2016-12-07 |
| Effective Date | 2016-12-07 |
| Expire Date | 2027-02-12 |
| Cancel Date | |
| Last Action Date | 2024-03-13 |
| End Date | 2027-02-12 |
| Available Date | 2029-02-13 |
| Applicant Type | B - Amateur Club |
| Entity Name | OLD DOMINION DX OPERATORS |
| Street Address / Locality | 615 KEARNEY CT VIENNA, VA 221806426 |
| County | Fairfax County |
| Zip Location | 38°53'43.6"N 77°15'22.1"W |
| Maidenhead | FM18iv |
| FRN | 0008513053 |
| Licensee ID/SGIN | L00261036 / 000 |
| Licensee Class | |
| Callsign Group | C - 1x3 |
| ULS/Geo Region | 4 / 4 / VA |
| Prev Callsign / Prev Class | KF4NTK |
| Next Callsign | |
| Trustee Callsign / Trustee Name | K5RJ JOHNSON, RAY C H |
| Vanity Type | F - By List (Club) |
| ULS File Number | 0007583191 |
| Phonetic weight / Morse weight | 10 / 64 |