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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 Jul 26, 23:00 UTC
Flights observed
662
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

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 - 9 2026-07-12
UCA4965 - 8 2026-07-19
UCA4336 - 8 2026-07-12
UCA4235 CommutAir 7 2026-06-26
UCA4227 - 7 2026-07-19
UCA4974 - 6 2026-07-21
UCA4947 - 6 2026-07-13
UCA4932 - 6 2026-07-23
UCA4851 - 6 2026-07-16
UCA4353 - 6 2026-07-14
UCA4344 - 6 2026-07-14
UCA4325 - 6 2026-06-29
UCA4314 - 6 2026-07-18
UCA4257 - 6 2026-07-22
UCA4253 CommutAir 6 2026-05-28
UCA4239 - 6 2026-06-19
UCA4986 - 5 2026-07-21
UCA4937 CommutAir 5 2026-04-25
UCA4914 CommutAir 5 2026-06-09
UCA4909 CommutAir 5 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UCA4256 IAH → BHM Jul 26, 21:35 UTCJul 26, 23:00 UTC1h 25m
2026-07-26 UCA4378 PVD → IAD Jul 26, 17:25 UTCJul 26, 18:45 UTC1h 20m
2026-07-26 UCA4358 IAD → PVD Jul 26, 15:05 UTCJul 26, 16:25 UTC1h 20m
2026-07-26 UCA4301 ICT → IAH Jul 26, 12:25 UTCJul 26, 13:30 UTC1h 5m
2026-07-26 UCA4296 MOB → IAH Jul 26, 04:15 UTCJul 26, 05:05 UTC50m
2026-07-25 UCA4909 HSV → IAH Jul 25, 20:50 UTCJul 25, 22:10 UTC1h 20m
2026-07-25 UCA4909 HSV → IAH Jul 25, 20:35 UTCJul 25, 22:10 UTC1h 35m
2026-07-25 UCA4262 IAD → STL Jul 25, 18:20 UTCJul 25, 19:45 UTC1h 25m
2026-07-25 UCA4281 IAD → BTV Jul 25, 15:05 UTCJul 25, 15:55 UTC50m
2026-07-25 UCA4335 IAD → BDL Jul 25, 12:55 UTCJul 25, 13:40 UTC45m
2026-07-25 UCA4335 IAD → BDL Jul 25, 12:46 UTCJul 25, 13:45 UTC59m
2026-07-24 UCA4327 IAD → SYR Jul 24, 22:50 UTCJul 24, 23:35 UTC45m
2026-07-24 UCA4349 IAD → BTV Jul 24, 17:25 UTCJul 24, 18:10 UTC45m
2026-07-24 UCA4958 GSP → IAD Jul 24, 14:55 UTCJul 24, 15:50 UTC55m
2026-07-24 UCA4961 - Jul 24, 13:10 UTCJul 24, 14:05 UTC55m
2026-07-24 UCA4311 - Jul 24, 10:10 UTCJul 24, 11:15 UTC1h 5m
2026-07-24 UCA4304 IAD → PHL Jul 24, 02:35 UTCJul 24, 03:40 UTC1h 5m
2026-07-24 UCA4829 IAD → PWM Jul 24, 00:10 UTCJul 24, 01:20 UTC1h 10m
2026-07-23 UCA4932 IAD → MHT Jul 23, 21:50 UTCJul 23, 23:00 UTC1h 10m
2026-07-23 UCA4362 ORF → IAD Jul 23, 19:55 UTCJul 23, 20:45 UTC50m
2026-07-23 UCA4362 ORF → IAD Jul 23, 19:08 UTCJul 23, 20:51 UTC1h 43m
2026-07-23 UCA4360 IAD → SYR Jul 23, 17:30 UTCJul 23, 18:15 UTC45m
2026-07-23 UCA4857 - Jul 23, 13:45 UTCJul 23, 15:05 UTC1h 20m
2026-07-22 UCA4932 IAD → MHT Jul 22, 22:05 UTCJul 22, 23:10 UTC1h 5m
2026-07-22 UCA4848 TYS → IAD Jul 22, 18:40 UTCJul 22, 20:10 UTC1h 30m
2026-07-22 UCA4257 - Jul 22, 15:10 UTCJul 22, 16:20 UTC1h 10m
2026-07-22 UCA4257 IAD → TYS Jul 22, 14:17 UTCJul 22, 16:23 UTC2h 6m
2026-07-22 UCA4925 - Jul 22, 11:50 UTCJul 22, 13:15 UTC1h 25m
2026-07-21 UCA4930 IAD → MHT Jul 21, 16:30 UTCJul 21, 17:40 UTC1h 10m
2026-07-21 UCA4974 - Jul 21, 14:40 UTCJul 21, 15:10 UTC30m
2026-07-21 UCA4974 MDT → IAD Jul 21, 14:42 UTCJul 21, 15:12 UTC30m
2026-07-21 UCA4986 - Jul 21, 12:50 UTCJul 21, 13:15 UTC25m
2026-07-21 UCA4313 PWM → IAD Jul 21, 02:35 UTCJul 21, 03:40 UTC1h 5m
2026-07-21 UCA4313 PWM → IAD Jul 21, 02:26 UTCJul 21, 03:39 UTC1h 13m
2026-07-21 UCA4963 - Jul 21, 00:40 UTCJul 21, 01:40 UTC1h 0m
2026-07-20 UCA4882 - Jul 20, 00:05 UTCJul 20, 00:30 UTC25m
2026-07-20 UCA4882 MDT → IAD Jul 20, 00:12 UTCJul 20, 00:33 UTC21m
2026-07-19 UCA4250 IAD → MDT Jul 19, 21:55 UTCJul 19, 22:25 UTC30m
2026-07-19 UCA4230 - Jul 19, 19:20 UTCJul 19, 20:10 UTC50m
2026-07-19 UCA4234 - Jul 19, 17:35 UTCJul 19, 18:15 UTC40m
2026-07-19 UCA4227 - Jul 19, 14:55 UTCJul 19, 15:45 UTC50m
2026-07-19 UCA4965 - Jul 19, 12:40 UTCJul 19, 13:20 UTC40m
2026-07-19 UCA4965 IAD → AVP Jul 19, 12:51 UTCJul 19, 13:14 UTC23m
2026-07-19 UCA4922 ROA → IAD Jul 19, 10:25 UTCJul 19, 11:00 UTC35m
2026-07-19 UCA4922 ROA → IAD Jul 19, 10:31 UTCJul 19, 11:14 UTC43m
2026-07-19 UCA4897 IAD → ROA Jul 19, 03:10 UTCJul 19, 03:45 UTC35m
2026-07-18 UCA4314 - Jul 18, 23:35 UTCJul 18, 23:55 UTC20m
2026-07-18 UCA4314 - Jul 18, 18:05 UTCJul 18, 20:10 UTC2h 5m
2026-07-18 UCA4369 - Jul 18, 15:45 UTCJul 18, 16:45 UTC1h 0m
2026-07-17 UCA4303 - Jul 17, 22:20 UTCJul 17, 23:25 UTC1h 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 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 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 A1C0EC, octal 50340354, decimal 10,600,684.
What flights does A1C0EC operate?
Mode-S A1C0EC has broadcast 20 distinct callsigns, including UCA4357, UCA4965, UCA4336, UCA4235, UCA4227.