Apparatus

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sensors Mode-S transponder

A18723

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N198NV · AIRBUS A-320 · operated by ALLEGIANT AIR LLC

Hex
A18723
Octal
50303443
Decimal
10,585,891
Country
US
Tail
N198NV
Type
A320
No current signal · last broadcast 4h ago
Flights observed
285
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A18723.

Country allocation

The ICAO 24-bit address A18723 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
AAY171 Allegiant Air 6 2026-05-31
AAY184 Allegiant Air 5 2026-06-04
AAY182 Allegiant Air 5 2026-06-04
AAY3163 Allegiant Air 4 2026-05-09
AAY3157 Allegiant Air 4 2026-05-14
AAY2304 Allegiant Air 4 2026-04-25
AAY1786 Allegiant Air 4 2026-06-05
AAY172 Allegiant Air 4 2026-06-07
AAY161 Allegiant Air 4 2026-06-04
AAY744 Allegiant Air 3 2026-04-23
AAY694 Allegiant Air 3 2026-04-23
AAY671 Allegiant Air 3 2026-04-15
AAY646 - 3 2026-04-13
AAY636 Allegiant Air 3 2026-04-23
AAY3171 Allegiant Air 3 2026-05-09
AAY3152 Allegiant Air 3 2026-05-10
AAY3151 Allegiant Air 3 2026-05-11
AAY3150 Allegiant Air 3 2026-05-11
AAY2302 - 3 2026-04-13
AAY212 Allegiant Air 3 2026-06-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 AAY3491 - Jul 13, 21:50 UTCJul 13, 23:10 UTC1h 20m
2026-07-13 AAY3490 - Jul 13, 19:20 UTCJul 13, 20:50 UTC1h 30m
2026-07-13 AAY579 - Jul 13, 15:10 UTCJul 13, 17:50 UTC2h 40m
2026-07-13 AAY563 - Jul 13, 11:25 UTCJul 13, 14:00 UTC2h 35m
2026-07-12 AAY544 LAS → GRR Jul 12, 22:05 UTCJul 13, 01:25 UTC3h 20m
2026-07-12 AAY562 - Jul 12, 16:45 UTCJul 12, 20:01 UTC3h 15m
2026-07-12 AAY571 BOS → GRR Jul 12, 13:45 UTCJul 12, 15:30 UTC1h 45m
2026-07-12 AAY552 - Jul 12, 10:45 UTCJul 12, 12:20 UTC1h 35m
2026-07-12 AAY537 - Jul 12, 00:35 UTCJul 12, 04:20 UTC3h 45m
2026-07-11 AAY536 - Jul 11, 19:15 UTCJul 11, 23:10 UTC3h 55m
2026-07-11 AAY2206 - Jul 11, 15:10 UTCJul 11, 17:25 UTC2h 15m
2026-07-11 AAY344 BNA → SFB Jul 11, 02:25 UTCJul 11, 03:50 UTC1h 25m
2026-07-10 AAY357 - Jul 10, 23:45 UTCJul 11, 01:10 UTC1h 25m
2026-07-10 AAY1228 SFB → CVG Jul 10, 20:40 UTCJul 10, 22:10 UTC1h 30m
2026-07-10 AAY1243 - Jul 10, 18:05 UTCJul 10, 19:30 UTC1h 25m
2026-07-10 AAY2834 - Jul 10, 14:45 UTCJul 10, 16:55 UTC2h 10m
2026-07-10 AAY2900 SFB → GRR Jul 10, 11:25 UTCJul 10, 13:35 UTC2h 10m
2026-07-10 AAY1192 - Jul 10, 02:20 UTCJul 10, 03:50 UTC1h 30m
2026-07-09 AAY2914 SFB → PBG Jul 9, 23:20 UTCJul 10, 01:05 UTC1h 45m
2026-07-09 AAY2881 - Jul 9, 20:00 UTCJul 9, 21:55 UTC1h 55m
2026-07-09 AAY2925 SFB → ALB Jul 9, 16:50 UTCJul 9, 18:25 UTC1h 35m
2026-07-09 AAY1303 - Jul 9, 13:45 UTCJul 9, 15:40 UTC1h 55m
2026-07-09 AAY1212 SFB → CAK Jul 9, 10:40 UTCJul 9, 12:25 UTC1h 45m
2026-07-08 AAY2971 SBN → SFB Jul 8, 18:05 UTCJul 8, 20:00 UTC1h 55m
2026-07-08 AAY2883 - Jul 8, 15:10 UTCJul 8, 17:00 UTC1h 50m
2026-07-07 AAY1299 SFB → GRR Jul 7, 18:20 UTCJul 7, 21:15 UTC2h 55m
2026-07-07 AAY1252 SFB → BGR Jul 7, 14:15 UTCJul 7, 16:55 UTC2h 40m
2026-07-06 AAY2937 - Jul 6, 18:20 UTCJul 6, 20:15 UTC1h 55m
2026-07-06 AAY2880 - Jul 6, 05:05 UTCJul 6, 05:15 UTC10m
2026-07-05 AAY2880 - Jul 5, 23:25 UTCJul 6, 01:10 UTC1h 45m
2026-07-05 AA2919 - Jul 5, 20:45 UTCJul 5, 21:45 UTC1h 0m
2026-07-05 AAY2944 - Jul 5, 18:00 UTCJul 5, 19:45 UTC1h 45m
2026-07-05 AAY1198 - Jul 5, 14:35 UTCJul 5, 16:35 UTC2h 0m
2026-07-05 AAY1223 - Jul 5, 11:35 UTCJul 5, 13:15 UTC1h 40m
2026-07-04 AAY1233 SFB → CAE Jul 4, 23:10 UTCJul 5, 00:40 UTC1h 30m
2026-07-04 AAY2937 - Jul 4, 20:45 UTCJul 4, 21:50 UTC1h 5m
2026-07-04 AA1253 - Jul 4, 18:10 UTCJul 4, 19:30 UTC1h 20m
2026-07-04 AAY2939 - Jul 4, 15:00 UTCJul 4, 16:25 UTC1h 25m
2026-07-04 AAY2830 SFB → ELM Jul 4, 02:05 UTCJul 4, 03:10 UTC1h 5m
2026-07-03 AAY2822 SFB → CHA Jul 3, 23:55 UTCJul 4, 01:05 UTC1h 10m
2026-07-03 AAY1278 ROA → SFB Jul 3, 21:20 UTCJul 3, 22:50 UTC1h 30m
2026-07-03 AAY2888 - Jul 3, 18:15 UTCJul 3, 19:35 UTC1h 20m
2026-07-03 AAY2916 MDT → SFB Jul 3, 14:35 UTCJul 3, 17:00 UTC2h 25m
2026-07-03 AAY1284 - Jul 3, 11:05 UTCJul 3, 13:20 UTC2h 15m
2026-07-03 AAY2895 - Jul 3, 06:10 UTCJul 3, 07:45 UTC1h 35m
2026-07-03 AAY2824 - Jul 3, 03:30 UTCJul 3, 05:00 UTC1h 30m
2026-07-02 AAY9598 - Jul 2, 19:05 UTCJul 2, 19:45 UTC40m
2026-07-02 AAY9698 - Jul 2, 13:50 UTCJul 2, 16:10 UTC2h 20m
2026-06-20 AAY9698 - Jun 20, 14:24 UTCJun 20, 16:55 UTC2h 30m
2026-06-20 AAY848 - Jun 20, 01:34 UTCJun 20, 03:44 UTC2h 10m

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 N198NV page for operator, model, and routing details .

Mode-S A18723 frequently asked

What is Mode-S code A18723?
A18723 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N198NV.
Where is Mode-S A18723 registered?
Mode-S code A18723 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 A18723 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A18723, octal 50303443, decimal 10,585,891.
What flights does A18723 operate?
Mode-S A18723 has broadcast 20 distinct callsigns, including AAY171, AAY184, AAY182, AAY3163, AAY3157.