N9TPB FCC License Search

🕒 FCC license data updated yesterday 7:15 am CDT (FCC files through Oct 4, 2026) · next update today 7:15 am CDT

Ask: HAMs within 5 miles of N9TPB · Extra class operators in Madison, WI · or try N9TPB · K9* wildcards · Smith, John · 0004797601 (FRN) · 53703 · Madison, WI

AI4XP HAM

✅ Available for a vanity request — free since Sep 16, 2011.

2x2 call: only Amateur Extra licensees can request it. No pending applications list it.

📬 QSL: no LoTW uploads on record · not eQSL AG · QRZ · HamQTH

Not currently held · 1 holder on record · available since Sep 16, 2011

Previous holder: Christopher C Slack

Held AI4XP Apr 26, 2007 → Sep 15, 2009 · first licensed Feb 26, 1991 as N1IMU · 3 licenses · FRN 0006027866

📦 Moved: Hadley, MA → Burlington, MA

N1IMU Active Amateur Extra · vanity Sep 15, 2009 → expires Sep 15, 2029

Licensee
Christopher C Slack

Address
355 Cambridge St
Burlington, MA 01803
42.5203, -71.2130 (street) · Grid FN42jm · CQ 5 · ITU 8 · map ↗

FRN
0006027866

Previous call
AI4XP

Last granted
Jul 3, 2019

Effective
Jul 13, 2019

Last action
Jul 13, 2019
FCC actions (7)
- Jul 13, 2019 — Administrative update LIAUA
- Jul 3, 2019 — License renewed LIREN
- May 4, 2016 — Administrative update LIAUA
- Jan 5, 2016 — Administrative update LIAUA
- Aug 27, 2013 — Administrative update LIAUA
- Sep 15, 2009 — Vanity call sign granted VANGRT
- Sep 15, 2009 — License issued LIISS
📦 Moved: Greenfield, MA → Hadley, MA

AI4XP Canceled Amateur Extra Apr 26, 2007 → Sep 15, 2009 (canceled)

Licensee
Christopher C Slack

Address
8 Wampanoag Dr.
Hadley, MA 01035
42.3565, -72.5686 (ZIP center) · Grid FN32ri · CQ 5 · ITU 8 · map ↗

FRN
0006027866

Last granted
Apr 26, 2007

Effective
Aug 27, 2009

Last action
Sep 15, 2009
FCC actions (5)
- Sep 15, 2009 — License canceled LICAN
- Aug 27, 2009 — Administrative update LIAUA
- Jun 7, 2007 — Administrative update LIAUA
- Apr 26, 2007 — License issued LIISS
- Apr 26, 2007 — Systematic call sign granted SYSGRT
N1IMU Expired Technician Plus Feb 26, 1991 → Feb 26, 2001 (expired)

Licensee
CHRISTOPHER C SLACK

Address
15 VALLEY VIEW DR
GREENFIELD, MA 01301
42.6268, -72.6015 (ZIP center) · Grid FN32qp · CQ 5 · ITU 8 · map ↗

FRN
0006027866

Last granted
Feb 26, 1991

Effective
Feb 26, 1991

Last action
Feb 27, 2003
FCC actions (1)
- Feb 27, 2003 — License expired LIEXP

Address history

From FCC database snapshots (2004 → now). "Seen" dates are the first and last snapshot showing that address.

Seen Apr 16, 2022 → Oct 4, 2026 · 13 snapshots · as N1IMU
Christopher C Slack
355 Cambridge St, Burlington, MA 01803
42.5203, -71.2130 (street) · Grid FN42jm · CQ 5 · ITU 8 · map ↗
Seen May 27, 2010 → Oct 4, 2026 · 47 snapshots · as AI4XP
Christopher C Slack
8 Wampanoag Dr., Hadley, MA 01035
42.3565, -72.5686 (ZIP center) · Grid FN32ri · CQ 5 · ITU 8 · map ↗
Seen Nov 7, 2004 → Oct 4, 2026 · 48 snapshots · as N1IMU
CHRISTOPHER C SLACK
15 VALLEY VIEW DR, GREENFIELD, MA 01301
42.6268, -72.6015 (ZIP center) · Grid FN32qp · CQ 5 · ITU 8 · map ↗
Seen Jun 30, 2016 → May 6, 2019 · 13 snapshots · as N1IMU
Christopher C Slack
55 Old Billerica Rd, Bedford, MA 01730
42.4993, -71.2819 (ZIP center) · Grid FN42il · CQ 5 · ITU 8 · map ↗
Seen Jan 14, 2016 → Mar 16, 2016 · 4 snapshots · as N1IMU
Christopher C Slack
36 River St. Apt 328, Hadley, MA 02453
42.3687, -71.2411 (ZIP center) · Grid FN42ji · CQ 5 · ITU 8 · map ↗
Seen Oct 22, 2013 → Nov 16, 2015 · 9 snapshots · as N1IMU
Christopher C Slack
29 Longview Dr, Florence, MA 01062
42.3230, -72.7018 (ZIP center) · Grid FN32ph · CQ 5 · ITU 8 · map ↗
Seen May 27, 2010 → Apr 12, 2013 · 8 snapshots · as N1IMU
Christopher C Slack
8 Wampanoag Drive, Hadley, MA 01035
42.3565, -72.5686 (ZIP center) · Grid FN32ri · CQ 5 · ITU 8 · map ↗

Others requesting AI4XP

1 application listed AI4XP as a choice, newest first.

Filed	Award	Applicant	Choice #	Status
May 23, 2002	Jun 10, 2002	KG4NXP · Jacobus P Engelbrecht · Sterling, VA	3	Granted

📡 On the air: APRS, digital & WSPR spots

No APRS positions, PSK Reporter reports or WSPR spots for AI4XP in the last 24 hours. They show up here within seconds of AI4XP beaconing on APRS, being heard on FT8, FT4 and other digital modes, or sending a WSPR beacon.