Apparatus

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sensors Mode-S transponder

A2ADDF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N27190 · EMBRAER ERJ-145XR · operated by UNITED AIRLINES INC

Hex
A2ADDF
Octal
50526737
Decimal
10,661,343
Country
US
Tail
N27190
Type
E45X
No current signal · last broadcast Jul 26, 19:50 UTC
Flights observed
584
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:50 UTC

Last known position

Most recent position reported by Mode-S A2ADDF.

Country allocation

The ICAO 24-bit address A2ADDF 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
UCA4224 - 8 2026-07-11
UCA4878 - 7 2026-07-10
UCA4354 CommutAir 7 2026-07-19
UCA4306 - 7 2026-07-19
UCA4929 - 6 2026-07-20
UCA4870 CommutAir 6 2026-05-25
UCA4839 - 6 2026-07-11
UCA4830 CommutAir 6 2026-07-21
UCA4377 - 6 2026-07-03
UCA4329 CommutAir 6 2026-06-04
UCA4322 - 6 2026-07-14
UCA4266 CommutAir 6 2026-06-11
UCA4229 CommutAir 6 2026-07-25
UCA4905 - 5 2026-07-14
UCA4894 CommutAir 5 2026-06-13
UCA4859 CommutAir 5 2026-07-19
UCA4852 CommutAir 5 2026-06-15
UCA4842 CommutAir 5 2026-05-19
UCA4825 - 5 2026-07-03
UCA4822 - 5 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UCA4831 IAD → ROA Jul 26, 19:10 UTCJul 26, 19:45 UTC35m
2026-07-26 UCA4240 HSV → IAD Jul 26, 17:15 UTCJul 26, 17:55 UTC40m
2026-07-26 UCA4240 HSV → IAD Jul 26, 13:30 UTCJul 26, 15:05 UTC1h 35m
2026-07-26 UCA4901 IAH → LBB Jul 26, 02:45 UTCJul 26, 04:05 UTC1h 20m
2026-07-26 UCA4954 ITH → IAD Jul 26, 00:00 UTCJul 26, 00:40 UTC40m
2026-07-25 UCA4945 IAD → ITH Jul 25, 21:50 UTCJul 25, 22:35 UTC45m
2026-07-25 UCA4838 IAH → ELP Jul 25, 19:15 UTCJul 25, 20:25 UTC1h 10m
2026-07-25 UCA4814 PVD → IAD Jul 25, 17:05 UTCJul 25, 18:05 UTC1h 0m
2026-07-25 UCA4367 PHL → IAD Jul 25, 14:35 UTCJul 25, 15:45 UTC1h 10m
2026-07-25 UCA4367 PHL → IAD Jul 25, 14:38 UTCJul 25, 15:41 UTC1h 3m
2026-07-25 UCA4229 XNA → IAH Jul 25, 12:35 UTCJul 25, 13:30 UTC55m
2026-07-25 UCA4244 OKC → IAH Jul 25, 10:45 UTCJul 25, 11:15 UTC30m
2026-07-25 UCA4964 IAD → MDT Jul 25, 03:10 UTCJul 25, 03:40 UTC30m
2026-07-25 UCA4954 ITH → IAD Jul 25, 00:00 UTCJul 25, 00:40 UTC40m
2026-07-24 UCA4945 IAD → ITH Jul 24, 22:30 UTCJul 24, 23:10 UTC40m
2026-07-24 UCA4229 XNA → IAH Jul 24, 19:00 UTCJul 24, 20:05 UTC1h 5m
2026-07-24 UCA4288 IAD → YUL Jul 24, 16:40 UTCJul 24, 17:40 UTC1h 0m
2026-07-24 UCA4325 HSV → IAD Jul 24, 14:05 UTCJul 24, 15:15 UTC1h 10m
2026-07-24 UCA3262 IAD → PWM Jul 24, 12:10 UTCJul 24, 13:10 UTC1h 0m
2026-07-23 UCA4267 IAD → PVD Jul 23, 23:50 UTCJul 24, 00:50 UTC1h 0m
2026-07-23 UCA4274 IAD → PVD Jul 23, 21:35 UTCJul 23, 22:45 UTC1h 10m
2026-07-23 UCA4314 - Jul 23, 18:05 UTCJul 23, 20:15 UTC2h 10m
2026-07-23 UCA4369 IAH → MOB Jul 23, 16:37 UTCJul 23, 17:25 UTC48m
2026-07-23 UCA4369 - Jul 23, 16:20 UTCJul 23, 17:20 UTC1h 0m
2026-07-22 UCA4247 PVD → IAD Jul 22, 23:10 UTCJul 22, 23:55 UTC45m
2026-07-22 UCA4341 PWM → IAD Jul 22, 21:30 UTCJul 22, 22:05 UTC35m
2026-07-22 UCA4341 PWM → IAD Jul 22, 21:34 UTCJul 22, 22:03 UTC29m
2026-07-22 UCA4374 LRD → IAH Jul 22, 19:10 UTCJul 22, 20:10 UTC1h 0m
2026-07-22 UCA4904 IAH → LRD Jul 22, 17:25 UTCJul 22, 18:15 UTC50m
2026-07-22 UCA4269 PVD → IAD Jul 22, 14:25 UTCJul 22, 15:50 UTC1h 25m
2026-07-22 UCA4292 IAH → HSV Jul 22, 01:15 UTCJul 22, 02:45 UTC1h 30m
2026-07-22 UCA4292 IAH → HSV Jul 22, 01:18 UTCJul 22, 02:40 UTC1h 22m
2026-07-21 UCA4379 - Jul 21, 21:40 UTCJul 21, 22:40 UTC1h 0m
2026-07-21 UCA4366 - Jul 21, 19:45 UTCJul 21, 20:30 UTC45m
2026-07-21 UCA4366 IAH → MFE Jul 21, 19:54 UTCJul 21, 20:40 UTC46m
2026-07-21 UCA4830 LIT → IAH Jul 21, 17:15 UTCJul 21, 18:10 UTC55m
2026-07-21 UCA4371 IAD → BDL Jul 21, 14:55 UTCJul 21, 15:45 UTC50m
2026-07-21 UCA4371 IAD → BDL Jul 21, 15:00 UTCJul 21, 15:53 UTC53m
2026-07-21 UCA4255 - Jul 21, 11:45 UTCJul 21, 13:05 UTC1h 20m
2026-07-21 UCA4343 IAD → PHL Jul 21, 01:15 UTCJul 21, 02:50 UTC1h 35m
2026-07-20 UCA4365 - Jul 20, 21:50 UTCJul 20, 22:45 UTC55m
2026-07-20 UCA4929 - Jul 20, 19:55 UTCJul 20, 20:35 UTC40m
2026-07-20 UCA4929 IAH → BRO Jul 20, 19:54 UTCJul 20, 20:45 UTC51m
2026-07-20 UCA4245 JAN → IAH Jul 20, 17:20 UTCJul 20, 18:05 UTC45m
2026-07-20 UCA4245 JAN → IAH Jul 20, 17:20 UTCJul 20, 18:05 UTC45m
2026-07-20 UCA4347 IAH → JAN Jul 20, 15:15 UTCJul 20, 16:00 UTC45m
2026-07-20 UCA4347 IAH → JAN Jul 20, 15:17 UTCJul 20, 16:13 UTC56m
2026-07-20 UCA4863 IAH → LRD Jul 20, 12:05 UTCJul 20, 13:30 UTC1h 25m
2026-07-19 UCA4306 - Jul 19, 22:25 UTCJul 19, 23:35 UTC1h 10m
2026-07-19 UCA4306 IAH → LBB Jul 19, 22:29 UTCJul 19, 23:41 UTC1h 12m

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 N27190 page for operator, model, and routing details .

Mode-S A2ADDF frequently asked

What is Mode-S code A2ADDF?
A2ADDF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N27190.
Where is Mode-S A2ADDF registered?
Mode-S code A2ADDF 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 A2ADDF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2ADDF, octal 50526737, decimal 10,661,343.
What flights does A2ADDF operate?
Mode-S A2ADDF has broadcast 20 distinct callsigns, including UCA4224, UCA4878, UCA4354, UCA4306, UCA4929.