Apparatus

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sensors Mode-S transponder

A18ADA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N199NV · operated by ALLEGIANT AIR LLC

Hex
A18ADA
Octal
50305332
Decimal
10,586,842
Country
US
Tail
N199NV
Type
A320
No current signal · last broadcast 28m ago
Flights observed
138
Distinct callsigns
20
Country
US
Last broadcast
28m ago

Last known position

Most recent position reported by Mode-S A18ADA.

Country allocation

The ICAO 24-bit address A18ADA 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
AAY570 Allegiant Air 8 2026-05-03
AAY553 Allegiant Air 7 2026-05-03
AAY549 Allegiant Air 6 2026-05-03
AAY581 Allegiant Air 3 2026-05-01
AAY573 Allegiant Air 3 2026-05-02
AAY567 Allegiant Air 3 2026-05-02
AAY547 Allegiant Air 3 2026-04-28
AAY542 Allegiant Air 3 2026-04-22
AAY541 Allegiant Air 3 2026-04-14
AAY538 Allegiant Air 3 2026-05-03
AAY537 Allegiant Air 3 2026-04-22
AAY2195 Allegiant Air 3 2026-04-16
AAY2174 Allegiant Air 3 2026-05-01
AAY2170 Allegiant Air 3 2026-04-27
AAY2161 Allegiant Air 3 2026-05-01
AAY971 Allegiant Air 2 2026-05-27
AAY583 - 2 2026-04-13
AAY582 Allegiant Air 2 2026-04-27
AAY577 Allegiant Air 2 2026-04-28
AAY568 Allegiant Air 2 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 AAY604 IND → BOS May 30, 12:40 UTCMay 30, 14:30 UTC1h 50m
2026-05-29 AAY619 BOS → IND May 29, 23:10 UTCMay 30, 00:35 UTC1h 25m
2026-05-29 AAY613 PIE → IND May 29, 20:15 UTCMay 29, 21:35 UTC1h 20m
2026-05-29 AAY2250 IND → SRQ May 29, 17:20 UTCMay 29, 19:05 UTC1h 45m
2026-05-29 AAY631 IND → PIE May 29, 14:10 UTCMay 29, 16:05 UTC1h 55m
2026-05-28 AAY1090 PIE → LEX May 28, 22:20 UTCMay 29, 00:10 UTC1h 50m
2026-05-28 AAY2700 PIE → FSD May 28, 19:55 UTCMay 28, 21:10 UTC1h 15m
2026-05-28 AAY2650 CID → PIE May 28, 17:30 UTCMay 28, 18:40 UTC1h 10m
2026-05-28 AAY1061 PIE → TVC May 28, 14:10 UTCMay 28, 16:35 UTC2h 25m
2026-05-28 AAY2597 PIE → PBG May 28, 10:05 UTCMay 28, 12:35 UTC2h 30m
2026-05-27 AAY2614 CID → PIE May 27, 18:15 UTCMay 27, 21:05 UTC2h 50m
2026-05-27 AAY971 PIE → BGR May 27, 14:00 UTCMay 27, 17:00 UTC3h 0m
2026-05-26 AAY1091 MDT → PIE May 26, 01:10 UTCMay 26, 03:00 UTC1h 50m
2026-05-25 AAY2639 PIE → USA May 25, 23:10 UTCMay 25, 23:54 UTC45m
2026-05-25 AAY986 PIE → PBG May 25, 20:55 UTCMay 25, 21:35 UTC40m
2026-05-25 AAY2634 OMA → PIE May 25, 18:00 UTCMay 25, 19:25 UTC1h 25m
2026-05-25 AAY993 FWA → PIE May 25, 14:50 UTCMay 25, 16:50 UTC2h 0m
2026-05-25 AAY996 LAS → GRR May 25, 11:20 UTCMay 25, 13:20 UTC2h 0m
2026-05-25 AAY4453 SAT → PIE May 25, 04:10 UTCMay 25, 06:15 UTC2h 5m
2026-05-25 AAY4452 CRP → PIE May 25, 01:55 UTCMay 25, 03:25 UTC1h 30m
2026-05-23 AAY4451 BWI → PIE May 23, 15:15 UTCMay 23, 17:00 UTC1h 45m
2026-05-23 AAY4450 PIE → DAY May 23, 11:05 UTCMay 23, 13:40 UTC2h 35m
2026-05-23 AAY971 PIE → BGR May 23, 03:25 UTCMay 23, 05:35 UTC2h 10m
2026-05-23 AAY1023 PIE → PSM May 23, 00:25 UTCMay 23, 02:25 UTC2h 0m
2026-05-22 AAY1028 BGR → PIE May 22, 21:25 UTCMay 22, 22:50 UTC1h 25m
2026-05-22 AAY983 BGR → PIE May 22, 17:35 UTCMay 22, 18:50 UTC1h 15m
2026-05-22 AAY1083 PIE → BNA May 22, 14:05 UTCMay 22, 16:05 UTC2h 0m
2026-05-22 AAY1063 EYW → PIE May 22, 10:30 UTCMay 22, 12:35 UTC2h 5m
2026-05-22 AAY1009 PIE → MLI May 22, 00:40 UTCMay 22, 03:00 UTC2h 20m
2026-05-21 AAY991 PIE → CAK May 21, 21:20 UTCMay 21, 23:20 UTC2h 0m
2026-05-21 AAY988 PBG → FLL May 21, 18:45 UTCMay 21, 20:05 UTC1h 20m
2026-05-21 AAY1076 PIE → ELM May 21, 16:15 UTCMay 21, 17:30 UTC1h 15m
2026-05-21 AAY2675 CHA → PIE May 21, 13:10 UTCMay 21, 14:50 UTC1h 40m
2026-05-21 AAY2654 BGR → PIE May 21, 10:15 UTCMay 21, 11:50 UTC1h 35m
2026-05-20 AAY2686 CKB → PIE May 20, 17:35 UTCMay 20, 20:30 UTC2h 55m
2026-05-20 AAY994 SBN → PIE May 20, 13:40 UTCMay 20, 16:25 UTC2h 45m
2026-05-19 AAY2620 PIE → FWA May 19, 02:20 UTCMay 19, 03:45 UTC1h 25m
2026-05-18 AAY2670 TOL → PIE May 18, 23:25 UTCMay 19, 00:55 UTC1h 30m
2026-05-18 AAY1054 TVC → PIE May 18, 20:35 UTCMay 18, 22:15 UTC1h 40m
2026-05-18 AAY2698 PIE → RFD May 18, 17:30 UTCMay 18, 19:10 UTC1h 39m
2026-05-18 AAY1099 PIE → ALB May 18, 14:25 UTCMay 18, 16:10 UTC1h 45m
2026-05-18 AAY1022 SWF → PIE May 18, 11:05 UTCMay 18, 12:55 UTC1h 50m
2026-05-17 AAY2597 PIE → PBG May 17, 22:55 UTCMay 18, 00:55 UTC2h 0m
2026-05-17 AAY2724 VPS → EWR May 17, 19:35 UTCMay 17, 21:45 UTC2h 10m
2026-05-17 AAY1074 LEX → PIE May 17, 15:31 UTCMay 17, 17:25 UTC1h 55m
2026-05-17 AAY2641 BLV → PIE May 17, 11:55 UTCMay 17, 13:55 UTC2h 0m
2026-05-16 AAY2596 PIE → LCK May 16, 02:15 UTCMay 16, 03:30 UTC1h 15m
2026-05-15 AAY1067 PIE → DAY May 15, 23:50 UTCMay 16, 01:10 UTC1h 20m
2026-05-15 AAY9601 LAS → YRQ May 15, 15:45 UTCMay 15, 19:00 UTC3h 15m
2026-05-07 AAY9699 YRQ → CVG May 7, 13:00 UTCMay 7, 14:20 UTC1h 20m

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 N199NV page for operator, model, and routing details .

Mode-S A18ADA frequently asked

What is Mode-S code A18ADA?
A18ADA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N199NV.
Where is Mode-S A18ADA registered?
Mode-S code A18ADA 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 A18ADA broadcasting right now?
No active broadcast right now. Last signal was 28m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A18ADA, octal 50305332, decimal 10,586,842.
What flights does A18ADA operate?
Mode-S A18ADA has broadcast 20 distinct callsigns, including AAY570, AAY553, AAY549, AAY581, AAY573.