Apparatus

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sensors Mode-S transponder

A2B05B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N27200 · EMBRAER ERJ-145XR · operated by UNITED AIRLINES INC

Hex
A2B05B
Octal
50530133
Decimal
10,661,979
Country
US
Tail
N27200
Type
E45X
No current signal · last broadcast Jul 25, 03:25 UTC
Flights observed
529
Distinct callsigns
20
Country
US
Last broadcast
Jul 25, 03:25 UTC

Last known position

Most recent position reported by Mode-S A2B05B.

Country allocation

The ICAO 24-bit address A2B05B 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
UCA4361 - 9 2026-06-28
UCA4917 - 8 2026-06-29
UCA4923 - 7 2026-07-15
UCA4821 - 7 2026-07-17
UCA4816 CommutAir 7 2026-07-18
UCA4323 CommutAir 7 2026-06-04
UCA4307 - 7 2026-07-15
UCA4304 CommutAir 7 2026-06-21
UCA4275 - 7 2026-07-17
UCA4224 CommutAir 7 2026-06-30
UCA4855 - 6 2026-06-29
UCA4844 - 6 2026-07-15
UCA4839 - 6 2026-06-30
UCA4827 - 6 2026-07-17
UCA4859 - 5 2026-07-09
UCA4830 CommutAir 5 2026-05-09
UCA4354 - 5 2026-07-09
UCA4346 - 5 2026-06-26
UCA4321 CommutAir 5 2026-07-25
UCA4314 - 5 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 UCA4321 IAD → ALB Jul 25, 02:30 UTCJul 25, 03:25 UTC55m
2026-07-25 UCA4259 IAH → HRL Jul 25, 00:05 UTCJul 25, 01:10 UTC1h 5m
2026-07-25 UCA4259 IAH → HRL Jul 25, 00:03 UTCJul 25, 01:19 UTC1h 16m
2026-07-24 UCA4364 IAD → CAE Jul 24, 22:00 UTCJul 24, 23:00 UTC1h 0m
2026-07-24 UCA4959 GSP → IAD Jul 24, 18:55 UTCJul 24, 20:05 UTC1h 10m
2026-07-24 UCA4962 IAD → GSP Jul 24, 17:00 UTCJul 24, 17:56 UTC56m
2026-07-24 UCA4962 IAD → GSP Jul 24, 16:45 UTCJul 24, 17:50 UTC1h 5m
2026-07-24 UCA4227 - Jul 24, 14:50 UTCJul 24, 15:30 UTC40m
2026-07-24 UCA4965 IAD → AVP Jul 24, 13:00 UTCJul 24, 13:35 UTC35m
2026-07-24 UCA4970 ALB → IAD Jul 24, 10:10 UTCJul 24, 11:20 UTC1h 10m
2026-07-24 UCA4321 IAD → ALB Jul 24, 02:30 UTCJul 24, 03:25 UTC55m
2026-07-24 UCA4882 IAH → PNS Jul 24, 00:05 UTCJul 24, 00:35 UTC30m
2026-07-23 UCA4250 IAD → MDT Jul 23, 22:05 UTCJul 23, 22:30 UTC25m
2026-07-23 UCA4230 AVP → IAD Jul 23, 20:05 UTCJul 23, 20:45 UTC40m
2026-07-23 UCA4230 AVP → IAD Jul 23, 19:27 UTCJul 23, 20:46 UTC1h 19m
2026-07-23 UCA4234 COD → DEN Jul 23, 17:55 UTCJul 23, 18:30 UTC35m
2026-07-23 UCA4958 GSP → IAD Jul 23, 14:40 UTCJul 23, 15:55 UTC1h 15m
2026-07-23 UCA4958 GSP → IAD Jul 23, 14:42 UTCJul 23, 15:55 UTC1h 13m
2026-07-23 UCA4961 - Jul 23, 12:40 UTCJul 23, 13:35 UTC55m
2026-07-23 UCA4970 ALB → IAD Jul 23, 10:10 UTCJul 23, 11:20 UTC1h 10m
2026-07-23 UCA4321 IAD → ALB Jul 23, 03:30 UTCJul 23, 04:20 UTC50m
2026-07-23 UCA4882 IAH → PNS Jul 23, 00:05 UTCJul 23, 00:35 UTC30m
2026-07-22 UCA4250 IAD → MDT Jul 22, 22:05 UTCJul 22, 22:25 UTC20m
2026-07-22 UCA4959 - Jul 22, 19:30 UTCJul 22, 20:30 UTC1h 0m
2026-07-22 UCA4962 IAD → GSP Jul 22, 17:25 UTCJul 22, 18:30 UTC1h 5m
2026-07-22 UCA4824 DAY → IAD Jul 22, 12:15 UTCJul 22, 13:15 UTC1h 0m
2026-07-21 UCA4241 IAD → DAY Jul 21, 17:00 UTCJul 21, 18:10 UTC1h 10m
2026-07-21 UCA4332 ROA → IAD Jul 21, 14:35 UTCJul 21, 14:45 UTC10m
2026-07-21 UCA4332 ROA → IAD Jul 21, 14:44 UTCJul 21, 15:20 UTC36m
2026-07-21 UCA4368 IAD → ROA Jul 21, 12:45 UTCJul 21, 13:25 UTC40m
2026-07-21 UCA4251 IAD → BUF Jul 21, 10:20 UTCJul 21, 11:05 UTC45m
2026-07-21 UCA4251 IAD → BUF Jul 21, 10:31 UTCJul 21, 11:05 UTC34m
2026-07-21 UCA4849 - Jul 21, 03:30 UTCJul 21, 04:15 UTC45m
2026-07-21 UCA4853 - Jul 21, 00:20 UTCJul 21, 01:10 UTC50m
2026-07-20 UCA4977 - Jul 20, 22:45 UTCJul 20, 23:30 UTC45m
2026-07-20 UCA4314 - Jul 20, 17:55 UTCJul 20, 20:00 UTC2h 5m
2026-07-20 UCA4314 MOB → IAD Jul 20, 18:02 UTCJul 20, 20:01 UTC1h 59m
2026-07-20 UCA4369 - Jul 20, 15:25 UTCJul 20, 16:30 UTC1h 5m
2026-07-20 UCA4852 - Jul 20, 11:25 UTCJul 20, 12:50 UTC1h 25m
2026-07-19 UCA4867 - Jul 19, 22:30 UTCJul 19, 23:40 UTC1h 10m
2026-07-19 UCA4289 - Jul 19, 19:35 UTCJul 19, 20:25 UTC50m
2026-07-19 UCA4896 IAH → JAN Jul 19, 17:45 UTCJul 19, 18:25 UTC40m
2026-07-19 UCA4269 PVD → IAD Jul 19, 14:25 UTCJul 19, 15:50 UTC1h 25m
2026-07-19 UCA4292 - Jul 19, 01:15 UTCJul 19, 02:40 UTC1h 25m
2026-07-18 UCA4816 AMA → IAH Jul 18, 20:30 UTCJul 18, 21:40 UTC1h 10m
2026-07-18 UCA4817 - Jul 18, 17:45 UTCJul 18, 18:50 UTC1h 5m
2026-07-18 UCA4233 - Jul 18, 14:30 UTCJul 18, 15:50 UTC1h 20m
2026-07-18 UCA4279 - Jul 18, 01:15 UTCJul 18, 02:35 UTC1h 20m
2026-07-17 UCA4339 - Jul 17, 22:35 UTCJul 18, 00:00 UTC1h 25m
2026-07-17 UCA4275 - Jul 17, 19:35 UTCJul 17, 20:50 UTC1h 15m

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 N27200 page for operator, model, and routing details .

Mode-S A2B05B frequently asked

What is Mode-S code A2B05B?
A2B05B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N27200.
Where is Mode-S A2B05B registered?
Mode-S code A2B05B 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 A2B05B broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 03:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2B05B, octal 50530133, decimal 10,661,979.
What flights does A2B05B operate?
Mode-S A2B05B has broadcast 20 distinct callsigns, including UCA4361, UCA4917, UCA4923, UCA4821, UCA4816.