Confidence: Medium · Source: FCC ULS · As of 2026-09-09

AC4HT

Active

HUMPHREVILLE, MARK K

Location: SPRINGFIELD, SC
Class: Amateur Extra
Granted: 2025-09-26
Expires: 2035-09-26
Previous call: KA3IVT
FRN: 0009370511

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Vanity availability

Held

Currently held

AC4HT is held by an active license; it isn't a vanity slot right now.

Vanity availability dates are computed from FCC §97.19's hold periods: 2 years from the cancellation date for cancelled or terminated licenses, 4 years from the expiration date for expired licenses (2-year renewal grace + 2-year hold).

Callsign genealogy

Full chain →

Previously held by current licensee

KA3IVT
no FCC ULS record on file

License history

0 events

No recorded events.

More vanity slots coming available

From South Carolina

All →

KQ4URH 2026-09-10
KG4VBH 2026-09-12
KK4LOZ 2026-09-13
KK4LPA 2026-09-13
KK4LPE 2026-09-13

Starting with AC4

All →

AC4VP FL · 2026-09-14
AC4UX CA · 2026-09-16
AC4SQ GA · 2026-09-19
AC4ZY TN · 2026-09-21
AC4FX TN · 2026-10-23

Full history → Vanity availability → Callsign genealogy →