Apparatus

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sensors Mode-S transponder

A15FA4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N188NV · operated by ALLEGIANT AIR LLC

Hex
A15FA4
Octal
50257644
Decimal
10,575,780
Country
US
Tail
N188NV
Type
A320
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
375
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S A15FA4.

Country allocation

The ICAO 24-bit address A15FA4 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
AAY3015 - 14 2026-07-13
AAY2975 - 14 2026-07-11
AAY1371 - 12 2026-07-03
AAY1354 Allegiant Air 12 2026-07-20
AAY2976 - 10 2026-07-11
AAY3007 Allegiant Air 9 2026-07-20
AAY3003 Allegiant Air 9 2026-06-15
AAY1369 Allegiant Air 9 2026-07-26
AAY1365 Allegiant Air 8 2026-07-18
AAY3019 - 7 2026-07-09
AAY3014 - 7 2026-06-29
AAY3012 Allegiant Air 7 2026-07-24
AAY3001 - 7 2026-07-05
AAY2977 Allegiant Air 7 2026-07-18
AAY1381 - 7 2026-07-11
AAY1379 - 7 2026-07-09
AAY1362 - 7 2026-07-14
AAY1352 Allegiant Air 7 2026-07-22
AAY3017 - 6 2026-07-12
AAY3002 Allegiant Air 6 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAY1386 BOS → SRQ Jul 26, 22:25 UTCJul 26, 23:00 UTC35m
2026-07-26 AAY2986 BOS → SRQ Jul 26, 19:25 UTCJul 26, 21:15 UTC1h 50m
2026-07-26 AAY3002 BOS → SRQ Jul 26, 16:10 UTCJul 26, 18:10 UTC2h 0m
2026-07-26 AAY1369 SYR → SRQ Jul 26, 13:20 UTCJul 26, 15:05 UTC1h 45m
2026-07-26 AAY3010 SRQ → FNT Jul 26, 10:00 UTCJul 26, 12:05 UTC2h 5m
2026-07-25 AAY1351 MSP → SRQ Jul 25, 20:50 UTCJul 25, 22:50 UTC2h 0m
2026-07-25 AAY3002 BOS → SRQ Jul 25, 17:35 UTCJul 25, 19:35 UTC2h 0m
2026-07-25 AAY1378 SRQ → CID Jul 25, 14:05 UTCJul 25, 16:25 UTC2h 20m
2026-07-25 AAY3009 BOS → SRQ Jul 25, 10:30 UTCJul 25, 12:55 UTC2h 25m
2026-07-25 AAY2980 SRQ → BLV Jul 25, 01:05 UTCJul 25, 02:45 UTC1h 40m
2026-07-24 AAY3005 SRQ → IND Jul 24, 17:20 UTCJul 24, 18:55 UTC1h 35m
2026-07-24 AAY1375 SRQ → SDF Jul 24, 14:40 UTCJul 24, 16:20 UTC1h 40m
2026-07-24 AAY3012 SRQ → BOS Jul 24, 11:30 UTCJul 24, 13:15 UTC1h 45m
2026-07-23 AAY3006 SRQ → CID Jul 23, 20:15 UTCJul 23, 22:00 UTC1h 45m
2026-07-23 AAY2997 CAK → SRQ Jul 23, 16:50 UTCJul 23, 18:45 UTC1h 55m
2026-07-23 AAY1368 SDF → SRQ Jul 23, 13:45 UTCJul 23, 15:50 UTC2h 5m
2026-07-23 AAY1353 - Jul 23, 10:10 UTCJul 23, 12:05 UTC1h 55m
2026-07-22 AAY1352 VPS → CVG Jul 22, 17:45 UTCJul 22, 20:25 UTC2h 40m
2026-07-22 AAY1351 MSP → SRQ Jul 22, 14:05 UTCJul 22, 16:35 UTC2h 30m
2026-07-21 AAY3004 - Jul 21, 00:15 UTCJul 21, 02:05 UTC1h 50m
2026-07-20 AAY1354 SRQ → BOS Jul 20, 21:05 UTCJul 20, 23:10 UTC2h 5m
2026-07-20 AAY1363 BOS → SRQ Jul 20, 17:40 UTCJul 20, 20:15 UTC2h 35m
2026-07-20 AAY1352 - Jul 20, 13:55 UTCJul 20, 16:15 UTC2h 20m
2026-07-20 AAY3007 SRQ → FWA Jul 20, 04:25 UTCJul 20, 06:10 UTC1h 45m
2026-07-20 AAY2997 - Jul 20, 01:20 UTCJul 20, 03:15 UTC1h 55m
2026-07-19 AAY2986 BOS → SRQ Jul 19, 21:55 UTCJul 20, 00:05 UTC2h 10m
2026-07-19 AAY3002 SRQ → BLV Jul 19, 18:30 UTCJul 19, 20:40 UTC2h 10m
2026-07-19 AAY1369 - Jul 19, 14:00 UTCJul 19, 15:55 UTC1h 55m
2026-07-19 AAY3010 SRQ → FNT Jul 19, 10:45 UTCJul 19, 12:40 UTC1h 55m
2026-07-19 AAY3004 - Jul 19, 01:40 UTCJul 19, 04:00 UTC2h 20m
2026-07-18 AAY2977 CAK → SRQ Jul 18, 21:50 UTCJul 18, 23:50 UTC2h 0m
2026-07-18 AAY1365 SRQ → CVG Jul 18, 18:00 UTCJul 18, 20:45 UTC2h 45m
2026-07-18 AAY1363 - Jul 18, 14:00 UTCJul 18, 16:40 UTC2h 40m
2026-07-18 AAY3006 SRQ → CID Jul 18, 00:35 UTCJul 18, 03:05 UTC2h 31m
2026-07-17 AAY2990 - Jul 17, 20:55 UTCJul 17, 23:30 UTC2h 35m
2026-07-17 AAY2993 SRQ → BOS Jul 17, 16:55 UTCJul 17, 19:09 UTC2h 15m
2026-07-17 AAY3016 PIA → SRQ Jul 17, 02:34 UTCJul 17, 04:14 UTC1h 40m
2026-07-16 AAY3005 SRQ → IND Jul 16, 22:49 UTCJul 17, 01:00 UTC2h 10m
2026-07-16 AAY2998 - Jul 16, 19:14 UTCJul 16, 21:25 UTC2h 10m
2026-07-16 AAY2988 ABE → SRQ Jul 16, 14:29 UTCJul 16, 16:40 UTC2h 10m
2026-07-16 AAY1355 SRQ → ABE Jul 16, 10:59 UTCJul 16, 13:25 UTC2h 25m
2026-07-15 AAY3004 - Jul 15, 22:00 UTCJul 16, 00:25 UTC2h 25m
2026-07-15 AAY1389 - Jul 15, 18:00 UTCJul 15, 20:35 UTC2h 35m
2026-07-15 AAY1369 CAK → SRQ Jul 15, 14:50 UTCJul 15, 16:50 UTC2h 0m
2026-07-15 AAY1375 - Jul 15, 11:35 UTCJul 15, 13:40 UTC2h 5m
2026-07-14 AAY1362 - Jul 14, 01:00 UTCJul 14, 03:05 UTC2h 5m
2026-07-13 AAY3015 - Jul 13, 21:50 UTCJul 13, 23:55 UTC2h 5m
2026-07-13 AAY2989 - Jul 13, 19:10 UTCJul 13, 20:45 UTC1h 35m
2026-07-13 AAY1376 - Jul 13, 16:40 UTCJul 13, 18:05 UTC1h 25m
2026-07-13 AAY3011 CAK → SRQ Jul 13, 13:05 UTCJul 13, 15:10 UTC2h 5m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N188NV page for operator, model, and routing details .

Mode-S A15FA4 frequently asked

What is Mode-S code A15FA4?
A15FA4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N188NV.
Where is Mode-S A15FA4 registered?
Mode-S code A15FA4 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A15FA4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A15FA4, octal 50257644, decimal 10,575,780.
What flights does A15FA4 operate?
Mode-S A15FA4 has broadcast 20 distinct callsigns, including AAY3015, AAY2975, AAY1371, AAY1354, AAY2976.