Apparatus

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sensors Mode-S transponder

A1C0EC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N21197 · EMBRAER ERJ-145XR · operated by UNITED AIRLINES INC

Hex
A1C0EC
Octal
50340354
Decimal
10,600,684
Country
US
Tail
N21197
Type
E45X
No current signal · last broadcast 2h ago
Flights observed
346
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A1C0EC.

Country allocation

The ICAO 24-bit address A1C0EC 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
UCA4357 CommutAir 7 2026-05-16
UCA4253 CommutAir 6 2026-05-28
UCA4937 CommutAir 5 2026-04-25
UCA4872 CommutAir 5 2026-05-24
UCA4341 CommutAir 5 2026-05-16
UCA4336 CommutAir 5 2026-05-15
UCA4235 CommutAir 5 2026-05-21
UCA4986 CommutAir 4 2026-05-10
UCA4974 CommutAir 4 2026-05-10
UCA4938 CommutAir 4 2026-05-28
UCA4932 CommutAir 4 2026-05-18
UCA4834 CommutAir 4 2026-05-15
UCA4831 CommutAir 4 2026-05-12
UCA4826 CommutAir 4 2026-05-11
UCA4816 CommutAir 4 2026-04-17
UCA4369 CommutAir 4 2026-04-26
UCA4353 CommutAir 4 2026-05-16
UCA4345 CommutAir 4 2026-05-11
UCA4325 CommutAir 4 2026-05-29
UCA4314 CommutAir 4 2026-04-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 UCA4310 IAD → BTV May 29, 22:10 UTCMay 29, 23:00 UTC50m
2026-05-29 UCA4229 XNA → IAH May 29, 19:00 UTCMay 29, 20:10 UTC1h 10m
2026-05-29 UCA4288 IAD → YUL May 29, 16:55 UTCMay 29, 18:03 UTC1h 8m
2026-05-29 UCA4288 IAD → YUL May 29, 17:00 UTCMay 29, 18:00 UTC1h 0m
2026-05-29 UCA4325 HSV → IAD May 29, 14:40 UTCMay 29, 15:50 UTC1h 10m
2026-05-29 UCA4325 HSV → IAD May 29, 14:25 UTCMay 29, 15:49 UTC1h 24m
2026-05-29 UCA4914 IAD → TYS May 29, 00:15 UTCMay 29, 01:20 UTC1h 5m
2026-05-29 UCA4914 IAD → TYS May 29, 00:03 UTCMay 29, 01:17 UTC1h 14m
2026-05-28 UCA4938 SCE → IAD May 28, 22:40 UTCMay 28, 23:05 UTC25m
2026-05-28 UCA4253 DEN → SGF May 28, 21:20 UTCMay 28, 21:45 UTC25m
2026-05-28 UCA4253 DEN → SGF May 28, 21:05 UTCMay 28, 22:15 UTC1h 10m
2026-05-28 UCA4340 HSV → IAD May 28, 18:15 UTCMay 28, 19:40 UTC1h 25m
2026-05-28 UCA4315 IAH → HSV May 28, 15:30 UTCMay 28, 17:00 UTC1h 30m
2026-05-28 UCA4315 IAH → HSV May 28, 15:27 UTCMay 28, 16:56 UTC1h 29m
2026-05-28 UCA4318 JAN → IAH May 28, 12:55 UTCMay 28, 13:45 UTC50m
2026-05-28 UCA4334 IAD → PVD May 28, 00:00 UTCMay 28, 00:40 UTC40m
2026-05-27 UCA4379 IAH → BTR May 27, 21:55 UTCMay 27, 22:50 UTC55m
2026-05-27 UCA4379 IAH → BTR May 27, 21:46 UTCMay 27, 22:44 UTC58m
2026-05-27 UCA4366 IAH → LRD May 27, 20:05 UTCMay 27, 21:00 UTC55m
2026-05-27 UCA4928 CRP → IAH May 27, 18:05 UTCMay 27, 18:55 UTC50m
2026-05-27 UCA4928 CRP → IAH May 27, 17:58 UTCMay 27, 18:55 UTC57m
2026-05-27 UCA4894 IAH → CRP May 27, 16:15 UTCMay 27, 17:05 UTC50m
2026-05-26 UCA4996 SGF → IAH May 26, 21:59 UTCMay 26, 22:59 UTC1h 0m
2026-05-26 UCA4911 GPT → IAH May 26, 19:45 UTCMay 26, 21:09 UTC1h 25m
2026-05-26 UCA4258 CVG → IAD May 26, 16:50 UTCMay 26, 18:10 UTC1h 20m
2026-05-26 UCA4293 IAH → PNS May 26, 13:15 UTCMay 26, 14:20 UTC1h 5m
2026-05-25 UCA4893 LBB → IAH May 25, 22:10 UTCMay 25, 23:45 UTC1h 35m
2026-05-25 UCA4879 GPT → IAH May 25, 18:50 UTCMay 25, 20:19 UTC1h 29m
2026-05-25 UCA4878 MOB → IAH May 25, 16:20 UTCMay 25, 17:35 UTC1h 15m
2026-05-25 UCA4312 IAD → CVG May 25, 02:00 UTCMay 25, 02:50 UTC50m
2026-05-24 UCA4978 LBB → IAH May 24, 23:00 UTCMay 24, 23:46 UTC46m
2026-05-24 UCA4978 LBB → IAH May 24, 22:04 UTCMay 24, 23:48 UTC1h 44m
2026-05-24 UCA4872 BRO → IAH May 24, 19:35 UTCMay 24, 20:35 UTC1h 0m
2026-05-24 UCA4872 BRO → IAH May 24, 19:41 UTCMay 24, 20:36 UTC55m
2026-05-24 UCA4294 IAD → PVD May 24, 17:20 UTCMay 24, 18:05 UTC45m
2026-05-24 UCA4820 PWM → IAD May 24, 15:20 UTCMay 24, 16:05 UTC45m
2026-05-24 UCA4820 PWM → IAD May 24, 15:17 UTCMay 24, 16:18 UTC1h 1m
2026-05-24 UCA4232 MOB → IAH May 24, 12:45 UTCMay 24, 13:30 UTC45m
2026-05-24 UCA4919 IAH → TUL May 24, 02:50 UTCMay 24, 03:40 UTC50m
2026-05-24 UCA4978 LBB → IAH May 24, 00:05 UTCMay 24, 01:20 UTC1h 15m
2026-05-23 UCA4872 BRO → IAH May 23, 21:30 UTCMay 23, 22:40 UTC1h 10m
2026-05-23 UCA4947 BTR → IAH May 23, 14:45 UTCMay 23, 16:10 UTC1h 25m
2026-05-23 UCA4254 DEN → SHV May 23, 02:05 UTCMay 23, 02:50 UTC44m
2026-05-23 UCA4984 IAH → AMA May 23, 00:45 UTCMay 23, 00:55 UTC10m
2026-05-22 UCA4375 BTR → IAH May 22, 23:20 UTCMay 22, 23:35 UTC15m
2026-05-22 UCA4980 BTR → IAH May 22, 21:35 UTCMay 22, 22:20 UTC45m
2026-05-22 UCA4344 IAH → HRL May 22, 20:00 UTCMay 22, 20:40 UTC40m
2026-05-22 UCA4245 JAN → IAH May 22, 17:15 UTCMay 22, 18:10 UTC55m
2026-05-22 UCA4347 IAH → JAN May 22, 15:10 UTCMay 22, 15:45 UTC35m
2026-05-22 UCA4299 HSV → IAH May 22, 12:00 UTCMay 22, 13:45 UTC1h 45m

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 N21197 page for operator, model, and routing details .

Mode-S A1C0EC frequently asked

What is Mode-S code A1C0EC?
A1C0EC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N21197.
Where is Mode-S A1C0EC registered?
Mode-S code A1C0EC 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 A1C0EC broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1C0EC, octal 50340354, decimal 10,600,684.
What flights does A1C0EC operate?
Mode-S A1C0EC has broadcast 20 distinct callsigns, including UCA4357, UCA4253, UCA4937, UCA4872, UCA4341.