Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A0855D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N13227 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
A0855D
Octal
50102535
Decimal
10,519,901
Country
US
Tail
N13227
Type
B738
Broadcasting now · callsign UAL604 · 3,775 ft
Flights observed
402
Distinct callsigns
20
Country
US
Last broadcast
54m ago

Current position

A0855D is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A0855D 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
UAL623 - 9 2026-06-21
UAL2135 - 7 2026-06-23
UAL493 - 5 2026-06-26
UAL2672 United Airlines 5 2026-05-31
UAL362 - 4 2026-07-11
UAL2849 - 4 2026-06-26
UAL2306 - 4 2026-07-03
UAL2059 - 4 2026-07-05
UAL1793 United Airlines 4 2026-04-16
UAL1657 - 4 2026-07-05
UAL1622 United Airlines 4 2026-05-11
UAL1546 United Airlines 4 2026-05-19
UAL1533 United Airlines 4 2026-05-16
UAL669 United Airlines 3 2026-05-05
UAL664 United Airlines 3 2026-06-15
UAL598 United Airlines 3 2026-04-30
UAL2724 - 3 2026-07-12
UAL2296 United Airlines 3 2026-04-18
UAL2160 United Airlines 3 2026-07-01
UAL2005 United Airlines 3 2026-05-31

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL604 - Jul 14, 13:25 UTCJul 14, 15:15 UTC1h 50m
2026-07-13 UAL575 - Jul 13, 12:10 UTCJul 13, 14:10 UTC2h 0m
2026-07-12 UAL2864 - Jul 12, 23:25 UTCJul 13, 01:35 UTC2h 10m
2026-07-12 UAL2864 IAH → CLT Jul 12, 23:33 UTCJul 13, 01:39 UTC2h 6m
2026-07-12 UAL2724 - Jul 12, 19:30 UTCJul 12, 21:45 UTC2h 15m
2026-07-12 UAL2724 - Jul 12, 15:10 UTCJul 12, 17:30 UTC2h 20m
2026-07-12 UAL2097 - Jul 12, 07:10 UTCJul 12, 11:15 UTC4h 5m
2026-07-12 UAL1083 - Jul 12, 03:30 UTCJul 12, 05:35 UTC2h 5m
2026-07-11 UAL1086 DEN → YVR Jul 11, 22:30 UTCJul 12, 01:10 UTC2h 40m
2026-07-11 UAL2470 YVR → DEN Jul 11, 18:15 UTCJul 11, 20:35 UTC2h 20m
2026-07-11 UAL362 DEN → YVR Jul 11, 14:00 UTCJul 11, 16:40 UTC2h 40m
2026-07-11 UAL362 STL → DEN Jul 11, 10:20 UTCJul 11, 12:15 UTC1h 55m
2026-07-11 UAL1422 DEN → STL Jul 11, 01:40 UTCJul 11, 03:15 UTC1h 35m
2026-07-10 UAL1662 SLC → DEN Jul 10, 20:35 UTCJul 10, 21:45 UTC1h 10m
2026-07-10 UAL1963 DEN → SLC Jul 10, 18:10 UTCJul 10, 19:15 UTC1h 5m
2026-07-10 UAL2459 STL → DEN Jul 10, 14:15 UTCJul 10, 16:05 UTC1h 50m
2026-07-10 UAL214 DEN → STL Jul 10, 03:45 UTCJul 10, 05:30 UTC1h 45m
2026-07-10 UAL2108 LAS → DEN Jul 10, 00:00 UTCJul 10, 01:25 UTC1h 25m
2026-07-09 UAL2156 IAD → LAS Jul 9, 17:35 UTCJul 9, 22:10 UTC4h 35m
2026-07-09 UAL2098 BOS → IAD Jul 9, 13:40 UTCJul 9, 14:48 UTC1h 8m
2026-07-09 UAL2098 BOS → IAD Jul 9, 13:40 UTCJul 9, 14:50 UTC1h 10m
2026-07-08 UAL2798 DEN → BOS Jul 8, 23:25 UTCJul 9, 03:00 UTC3h 35m
2026-07-08 UAL2470 YVR → DEN Jul 8, 18:05 UTCJul 8, 20:25 UTC2h 20m
2026-07-08 UAL362 DEN → YVR Jul 8, 14:10 UTCJul 8, 16:40 UTC2h 30m
2026-07-08 UAL362 STL → DEN Jul 8, 10:30 UTCJul 8, 12:20 UTC1h 50m
2026-07-08 UAL1422 DEN → STL Jul 8, 00:22 UTCJul 8, 01:59 UTC1h 37m
2026-07-08 UAL1422 DEN → STL Jul 8, 00:15 UTCJul 8, 02:00 UTC1h 45m
2026-07-07 UAL479 - Jul 7, 19:45 UTCJul 7, 22:45 UTC3h 0m
2026-07-07 UAL479 CVG → DEN Jul 7, 19:43 UTCJul 7, 22:42 UTC2h 59m
2026-07-07 UAL1978 EWR → SFO Jul 7, 16:05 UTCJul 7, 18:20 UTC2h 15m
2026-07-07 UAL1241 EUG → DEN Jul 7, 12:05 UTCJul 7, 14:10 UTC2h 5m
2026-07-07 UAL1303 EWR → IAH Jul 7, 02:15 UTCJul 7, 04:25 UTC2h 10m
2026-07-06 UAL2123 - Jul 6, 23:55 UTCJul 7, 01:10 UTC1h 15m
2026-07-06 UAL586 - Jul 6, 20:05 UTCJul 6, 21:15 UTC1h 10m
2026-07-06 UAL640 YVR → DEN Jul 6, 16:00 UTCJul 6, 18:20 UTC2h 20m
2026-07-06 UAL1580 ORD → YVR Jul 6, 05:05 UTCJul 6, 08:44 UTC3h 39m
2026-07-06 UAL1580 ORD → YVR Jul 6, 04:50 UTCJul 6, 08:50 UTC4h 0m
2026-07-05 UAL2059 ROC → ORD Jul 5, 23:15 UTCJul 6, 00:45 UTC1h 30m
2026-07-05 UAL1239 - Jul 5, 20:20 UTCJul 5, 21:40 UTC1h 20m
2026-07-05 UAL2635 LGA → ORD Jul 5, 16:35 UTCJul 5, 18:35 UTC2h 0m
2026-07-05 UAL1657 - Jul 5, 13:40 UTCJul 5, 15:10 UTC1h 30m
2026-07-05 UAL2752 - Jul 5, 11:15 UTCJul 5, 12:10 UTC55m
2026-07-05 UAL2148 ORD → CVG Jul 5, 05:20 UTCJul 5, 06:00 UTC40m
2026-07-05 UAL326 BGR → ORD Jul 5, 01:15 UTCJul 5, 03:45 UTC2h 30m
2026-07-04 UAL596 DEN → BGR Jul 4, 16:01 UTCJul 4, 19:22 UTC3h 21m
2026-07-04 UAL596 - Jul 4, 16:05 UTCJul 4, 19:15 UTC3h 10m
2026-07-04 UAL2865 SBA → DEN Jul 4, 12:15 UTCJul 4, 14:10 UTC1h 55m
2026-07-04 UAL2479 DEN → SBA Jul 4, 03:55 UTCJul 4, 06:05 UTC2h 10m
2026-07-04 UAL1483 STL → DEN Jul 4, 01:00 UTCJul 4, 02:50 UTC1h 50m
2026-07-03 UAL2000 ORD → STL Jul 3, 21:40 UTCJul 3, 22:25 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 N13227 page for operator, model, and routing details .

Mode-S A0855D frequently asked

What is Mode-S code A0855D?
A0855D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N13227.
Where is Mode-S A0855D registered?
Mode-S code A0855D 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 A0855D broadcasting right now?
Yes. Mode-S A0855D is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0855D, octal 50102535, decimal 10,519,901.
What flights does A0855D operate?
Mode-S A0855D has broadcast 20 distinct callsigns, including UAL623, UAL2135, UAL493, UAL2672, UAL362.