Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A05DDC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N12225 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
A05DDC
Octal
50056734
Decimal
10,509,788
Country
US
Tail
N12225
Type
B738
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
460
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S A05DDC.

Country allocation

The ICAO 24-bit address A05DDC 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
UAL2155 - 7 2026-07-10
UAL2177 United Airlines 6 2026-06-09
UAL1049 United Airlines 6 2026-05-26
UAL275 - 5 2026-06-28
UAL2459 - 5 2026-07-13
UAL2383 - 5 2026-07-09
UAL1911 - 5 2026-06-29
UAL645 United Airlines 4 2026-06-04
UAL497 - 4 2026-06-14
UAL2637 United Airlines 4 2026-05-27
UAL251 - 4 2026-06-28
UAL2167 - 4 2026-06-18
UAL1884 United Airlines 4 2026-06-07
UAL1823 United Airlines 4 2026-05-20
UAL1408 - 4 2026-07-19
UAL1405 United Airlines 4 2026-07-19
UAL1156 United Airlines 4 2026-05-30
UAL786 - 3 2026-07-11
UAL590 United Airlines 3 2026-05-01
UAL478 - 3 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL287 EWR → BOS Jul 26, 19:45 UTCJul 26, 23:00 UTC3h 15m
2026-07-26 UAL2804 IAD → EWR Jul 26, 16:30 UTCJul 26, 18:15 UTC1h 45m
2026-07-25 UAL1180 DEN → CID Jul 25, 14:00 UTCJul 25, 21:30 UTC7h 30m
2026-07-25 UAL660 EWR → CHS Jul 25, 10:10 UTCJul 25, 11:55 UTC1h 45m
2026-07-25 UAL8244 TPA → MCO Jul 25, 03:35 UTCJul 25, 05:00 UTC1h 25m
2026-07-24 UAL2797 ORD → GRR Jul 24, 23:45 UTCJul 25, 01:25 UTC1h 40m
2026-07-24 UAL2430 ORD → ALB Jul 24, 21:00 UTCJul 24, 22:30 UTC1h 30m
2026-07-24 UAL2331 IAD → RDU Jul 24, 19:15 UTCJul 24, 19:20 UTC5m
2026-07-24 UAL2331 IAD → RDU Jul 24, 17:50 UTCJul 24, 19:20 UTC1h 30m
2026-07-24 UAL1549 ORD → PSP Jul 24, 12:30 UTCJul 24, 15:00 UTC2h 30m
2026-07-24 UAL2189 MSY → ORD Jul 24, 00:40 UTCJul 24, 03:40 UTC3h 0m
2026-07-23 UAL2249 PHX → SFO Jul 23, 19:40 UTCJul 23, 22:50 UTC3h 10m
2026-07-23 UAL2135 EWR → MCO Jul 23, 14:15 UTCJul 23, 18:00 UTC3h 45m
2026-07-22 UAL2638 EWR → RSW Jul 22, 22:25 UTCJul 23, 02:35 UTC4h 10m
2026-07-22 UAL2638 EWR → RSW Jul 22, 22:26 UTCJul 23, 02:27 UTC4h 1m
2026-07-22 UAL692 - Jul 22, 17:25 UTCJul 22, 20:35 UTC3h 10m
2026-07-22 UAL2092 ORD → LGA Jul 22, 13:30 UTCJul 22, 15:00 UTC1h 30m
2026-07-22 UAL675C EWR → SNA Jul 22, 03:55 UTCJul 22, 05:20 UTC1h 25m
2026-07-21 UAL2101 PBI → EWR Jul 21, 22:10 UTCJul 22, 02:05 UTC3h 55m
2026-07-21 UAL2101 PBI → EWR Jul 21, 21:52 UTCJul 22, 01:34 UTC3h 42m
2026-07-21 UAL2205 CMH → IAH Jul 21, 15:15 UTCJul 21, 19:10 UTC3h 55m
2026-07-21 UAL2371 DFW → SFO Jul 21, 10:15 UTCJul 21, 13:15 UTC3h 0m
2026-07-21 UAL2783 SFO → GUM Jul 21, 00:00 UTCJul 21, 03:10 UTC3h 10m
2026-07-20 UAL2043 - Jul 20, 15:00 UTCJul 20, 20:50 UTC5h 50m
2026-07-20 UAL2074 IAD → DEN Jul 20, 10:50 UTCJul 20, 13:00 UTC2h 10m
2026-07-19 UAL2498 - Jul 19, 23:25 UTCJul 20, 01:45 UTC2h 20m
2026-07-19 UAL1405 BZE → IAH Jul 19, 18:40 UTCJul 19, 20:30 UTC1h 50m
2026-07-19 UAL1408 - Jul 19, 15:05 UTCJul 19, 16:50 UTC1h 45m
2026-07-19 UAL1408 IAH → BZE Jul 19, 15:02 UTCJul 19, 17:09 UTC2h 7m
2026-07-19 UAL2314 - Jul 19, 11:20 UTCJul 19, 13:35 UTC2h 15m
2026-07-18 UAL1956 - Jul 18, 23:40 UTCJul 19, 01:45 UTC2h 5m
2026-07-18 UAL2103 SJD → IAH Jul 18, 18:46 UTCJul 18, 20:39 UTC1h 53m
2026-07-18 UAL2103 - Jul 18, 14:45 UTCJul 18, 20:40 UTC5h 55m
2026-07-18 UAL1935 - Jul 18, 10:30 UTCJul 18, 13:05 UTC2h 35m
2026-07-16 UAL3857 NCE → ORD Jul 16, 21:30 UTCJul 17, 01:09 UTC3h 40m
2026-07-13 UAL2459 DEN → YYC Jul 13, 17:50 UTCJul 13, 19:40 UTC1h 50m
2026-07-13 UAL2459 DEN → YYC Jul 13, 17:45 UTCJul 13, 19:40 UTC1h 55m
2026-07-13 UAL318 RSW → DEN Jul 13, 12:05 UTCJul 13, 15:35 UTC3h 30m
2026-07-12 UAL2348 DEN → RSW Jul 12, 22:20 UTCJul 13, 01:40 UTC3h 20m
2026-07-12 UAL1788 - Jul 12, 19:55 UTCJul 12, 20:30 UTC35m
2026-07-12 UAL1788 GJT → DEN Jul 12, 19:52 UTCJul 12, 20:39 UTC47m
2026-07-12 UAL1714 - Jul 12, 17:35 UTCJul 12, 17:50 UTC15m
2026-07-12 UAL2789 - Jul 12, 14:45 UTCJul 12, 15:50 UTC1h 5m
2026-07-12 UAL2166 DEN → ICT Jul 12, 01:43 UTCJul 12, 02:26 UTC43m
2026-07-12 UAL2166 DEN → ICT Jul 12, 01:30 UTCJul 12, 02:25 UTC55m
2026-07-11 UAL517 - Jul 11, 19:40 UTCJul 11, 23:10 UTC3h 30m
2026-07-11 UAL786 - Jul 11, 16:25 UTCJul 11, 18:05 UTC1h 40m
2026-07-11 UAL1811 PHL → ORD Jul 11, 12:15 UTCJul 11, 14:15 UTC2h 0m
2026-07-11 UAL1510 DEN → PHL Jul 11, 02:20 UTCJul 11, 05:20 UTC3h 0m
2026-07-10 UAL1199 - Jul 10, 21:25 UTCJul 10, 22:40 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 N12225 page for operator, model, and routing details .

Mode-S A05DDC frequently asked

What is Mode-S code A05DDC?
A05DDC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N12225.
Where is Mode-S A05DDC registered?
Mode-S code A05DDC 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 A05DDC 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 A05DDC, octal 50056734, decimal 10,509,788.
What flights does A05DDC operate?
Mode-S A05DDC has broadcast 20 distinct callsigns, including UAL2155, UAL2177, UAL1049, UAL275, UAL2459.