Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
Broadcasting now · callsign UCA4353 · 1,850 ft
Flights observed
584
Distinct callsigns
20
Country
US
Last broadcast
14m ago

Current position

A1C0EC is currently broadcasting. Map zoomed to live position.

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
UCA4336 - 8 2026-07-12
UCA4235 CommutAir 7 2026-06-26
UCA4965 CommutAir 6 2026-06-07
UCA4947 - 6 2026-07-13
UCA4325 - 6 2026-06-29
UCA4253 CommutAir 6 2026-05-28
UCA4239 - 6 2026-06-19
UCA4227 CommutAir 6 2026-06-07
UCA4937 CommutAir 5 2026-04-25
UCA4914 CommutAir 5 2026-06-09
UCA4872 CommutAir 5 2026-05-24
UCA4852 - 5 2026-07-10
UCA4366 - 5 2026-07-11
UCA4354 - 5 2026-06-16
UCA4353 - 5 2026-07-14
UCA4341 CommutAir 5 2026-05-16
UCA4310 - 5 2026-06-28
UCA4298 - 5 2026-07-09
UCA4293 - 5 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UCA4353 - Jul 14, 02:30 UTCJul 14, 03:00 UTC30m
2026-07-14 UCA4278 - Jul 14, 00:55 UTCJul 14, 01:40 UTC45m
2026-07-13 UCA4934 - Jul 13, 23:20 UTCJul 13, 23:45 UTC25m
2026-07-13 UCA4934 LCH → IAH Jul 13, 23:14 UTCJul 13, 23:47 UTC33m
2026-07-13 UCA4921 - Jul 13, 21:55 UTCJul 13, 22:15 UTC20m
2026-07-13 UCA4947 - Jul 13, 19:45 UTCJul 13, 20:20 UTC35m
2026-07-13 UCA4947 - Jul 13, 15:30 UTCJul 13, 17:10 UTC1h 40m
2026-07-13 UCA4947 BTR → CLL Jul 13, 15:09 UTCJul 13, 17:15 UTC2h 6m
2026-07-13 UCA4260 - Jul 13, 13:35 UTCJul 13, 14:25 UTC50m
2026-07-13 UCA4984 - Jul 13, 00:30 UTCJul 13, 00:50 UTC20m
2026-07-12 UCA4375 - Jul 12, 22:35 UTCJul 12, 22:50 UTC15m
2026-07-12 UCA4326 - Jul 12, 19:10 UTCJul 12, 20:05 UTC55m
2026-07-12 UCA4326 BTR → IAH Jul 12, 19:18 UTCJul 12, 19:59 UTC41m
2026-07-12 UCA4336 - Jul 12, 17:30 UTCJul 12, 18:15 UTC45m
2026-07-12 UCA4336 IAH → BTR Jul 12, 17:32 UTCJul 12, 18:14 UTC42m
2026-07-12 UCA4357 - Jul 12, 14:50 UTCJul 12, 15:45 UTC55m
2026-07-12 UCA4892 - Jul 12, 02:50 UTCJul 12, 03:45 UTC55m
2026-07-11 UCA4379 - Jul 11, 21:45 UTCJul 11, 22:50 UTC1h 5m
2026-07-11 UCA4366 - Jul 11, 19:50 UTCJul 11, 20:40 UTC50m
2026-07-11 UCA4928 - Jul 11, 18:10 UTCJul 11, 18:50 UTC40m
2026-07-11 UCA4894 - Jul 11, 15:45 UTCJul 11, 16:50 UTC1h 5m
2026-07-11 UCA4894 IAH → CRP Jul 11, 15:27 UTCJul 11, 16:47 UTC1h 20m
2026-07-11 UCA4318 - Jul 11, 13:00 UTCJul 11, 13:45 UTC45m
2026-07-11 UCA4318 JAN → IAH Jul 11, 12:30 UTCJul 11, 14:04 UTC1h 34m
2026-07-11 UCA4334 - Jul 11, 01:05 UTCJul 11, 01:45 UTC40m
2026-07-10 UCA4379 - Jul 10, 23:20 UTCJul 11, 00:10 UTC50m
2026-07-10 UCA4366 - Jul 10, 21:25 UTCJul 10, 22:15 UTC50m
2026-07-10 UCA4851 - Jul 10, 19:40 UTCJul 10, 20:25 UTC45m
2026-07-10 UCA4851 - Jul 10, 16:50 UTCJul 10, 18:45 UTC1h 55m
2026-07-10 UCA4225 - Jul 10, 14:10 UTCJul 10, 15:30 UTC1h 20m
2026-07-10 UCA4852 - Jul 10, 11:20 UTCJul 10, 12:45 UTC1h 25m
2026-07-10 UCA4852 SGF → IAH Jul 10, 11:35 UTCJul 10, 12:29 UTC54m
2026-07-09 UCA4867 - Jul 9, 22:30 UTCJul 9, 23:40 UTC1h 10m
2026-07-09 UCA4835 - Jul 9, 19:25 UTCJul 9, 20:15 UTC50m
2026-07-09 UCA4298 - Jul 9, 17:20 UTCJul 9, 18:05 UTC45m
2026-07-09 UCA4298 IAH → MFE Jul 9, 17:32 UTCJul 9, 18:12 UTC40m
2026-07-09 UCA4282 - Jul 9, 14:30 UTCJul 9, 15:25 UTC55m
2026-07-09 UCA4320 - Jul 9, 01:35 UTCJul 9, 02:20 UTC45m
2026-07-08 UCA4996 - Jul 8, 22:40 UTCJul 9, 00:10 UTC1h 30m
2026-07-08 UCA4911 - Jul 8, 20:15 UTCJul 8, 21:30 UTC1h 15m
2026-07-04 UCA4258 - Jul 4, 16:45 UTCJul 4, 18:00 UTC1h 15m
2026-07-04 UCA4293 - Jul 4, 13:40 UTCJul 4, 14:55 UTC1h 15m
2026-07-02 UCA4326 - Jul 2, 21:05 UTCJul 2, 21:50 UTC45m
2026-07-02 UCA4326 BTR → IAH Jul 2, 20:43 UTCJul 2, 21:51 UTC1h 8m
2026-07-02 UCA4336 - Jul 2, 18:30 UTCJul 2, 19:15 UTC45m
2026-07-02 UCA4947 - Jul 2, 15:05 UTCJul 2, 15:50 UTC45m
2026-07-02 UCA4947 BTR → IAH Jul 2, 14:47 UTCJul 2, 15:48 UTC1h 1m
2026-07-02 UCA4260 - Jul 2, 12:50 UTCJul 2, 13:35 UTC45m
2026-07-02 UCA4248 - Jul 2, 10:35 UTCJul 2, 11:25 UTC50m
2026-07-02 UCA4919 - Jul 2, 02:00 UTCJul 2, 02:45 UTC45m

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?
Yes. Mode-S A1C0EC is currently airborne.
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, UCA4336, UCA4235, UCA4965, UCA4947.