Apparatus

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sensors Mode-S transponder

A61D00

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N493UA · AIRBUS A-320 · operated by UNITED AIRLINES INC

Hex
A61D00
Octal
51416400
Decimal
10,886,400
Country
US
Tail
N493UA
Type
A320
Transponder active on ground
Flights observed
232
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A61D00.

Country allocation

The ICAO 24-bit address A61D00 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
UAL255 United Airlines 4 2026-06-12
UAL1376 United Airlines 4 2026-06-11
UAL1204 United Airlines 4 2026-06-12
UAL636 United Airlines 3 2026-04-27
UAL576 United Airlines 3 2026-05-12
UAL498 United Airlines 3 2026-06-05
UAL3874 United Airlines 3 2026-05-11
UAL387 United Airlines 3 2026-05-19
UAL2187 United Airlines 3 2026-06-03
UAL1282 United Airlines 3 2026-06-07
UAL1235 United Airlines 3 2026-06-06
UAL1082 United Airlines 3 2026-04-25
UAL822 United Airlines 2 2026-05-26
UAL790 United Airlines 2 2026-06-03
UAL773 United Airlines 2 2026-05-30
UAL756 United Airlines 2 2026-06-05
UAL726 United Airlines 2 2026-05-03
UAL616 United Airlines 2 2026-05-23
UAL495 United Airlines 2 2026-05-03
UAL424 United Airlines 2 2026-05-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-12 UAL1604 SFO → BNA Jun 12, 22:45 UTCJun 13, 00:35 UTC1h 50m
2026-06-12 UAL352 IAD → BOS Jun 12, 19:50 UTCJun 12, 20:20 UTC30m
2026-06-12 UAL1772 EWR → MYR Jun 12, 18:05 UTCJun 12, 18:35 UTC30m
2026-06-12 UAL255 ATL → EWR Jun 12, 13:55 UTCJun 12, 16:00 UTC2h 5m
2026-06-12 UAL255 ATL → EWR Jun 12, 13:50 UTCJun 12, 16:11 UTC2h 21m
2026-06-12 UAL1204 DEN → SJC Jun 12, 00:30 UTCJun 12, 02:15 UTC1h 45m
2026-06-12 UAL1204 DEN → SJC Jun 12, 00:30 UTCJun 12, 02:20 UTC1h 50m
2026-06-11 UAL2447 RSW → EWR Jun 11, 20:35 UTCJun 11, 22:50 UTC2h 15m
2026-06-11 UAL1026 DEN → AUS Jun 11, 17:25 UTCJun 11, 19:05 UTC1h 40m
2026-06-11 UAL1026 DEN → AUS Jun 11, 16:56 UTCJun 11, 19:03 UTC2h 7m
2026-06-11 UAL1376 RDU → EWR Jun 11, 13:25 UTCJun 11, 15:55 UTC2h 30m
2026-06-11 UAL1376 RDU → EWR Jun 11, 13:15 UTCJun 11, 15:47 UTC2h 32m
2026-06-11 UAL1541 IAH → LGA Jun 11, 00:50 UTCJun 11, 02:55 UTC2h 5m
2026-06-10 UAL2791 BWI → EWR Jun 10, 21:40 UTCJun 10, 22:05 UTC25m
2026-06-10 UAL2757 IAD → SFO Jun 10, 18:00 UTCJun 10, 19:35 UTC1h 35m
2026-06-10 UAL2757 IAD → SFO Jun 10, 18:02 UTCJun 10, 19:53 UTC1h 51m
2026-06-10 UAL1431 IAH → SNA Jun 10, 01:35 UTCJun 10, 16:00 UTC14h 25m
2026-06-09 UAL431 BDL → IAD Jun 9, 20:45 UTCJun 10, 00:05 UTC3h 20m
2026-06-09 UAL1505 EWR → DEN Jun 9, 16:50 UTCJun 9, 19:55 UTC3h 5m
2026-06-09 UAL1482 SAT → SFO Jun 9, 12:18 UTCJun 9, 14:35 UTC2h 17m
2026-06-09 UAL1482 SAT → SFO Jun 9, 12:15 UTCJun 9, 14:40 UTC2h 25m
2026-06-09 UAL1841 SFO → IAH Jun 9, 03:05 UTCJun 9, 04:55 UTC1h 50m
2026-06-08 UAL1208 IAH → EWR Jun 8, 23:45 UTCJun 9, 02:05 UTC2h 20m
2026-06-08 UAL255 ATL → EWR Jun 8, 13:55 UTCJun 8, 16:15 UTC2h 20m
2026-06-08 UAL1204 DEN → SJC Jun 8, 00:15 UTCJun 8, 02:05 UTC1h 50m
2026-06-07 UAL1282 EWR → RSW Jun 7, 20:55 UTCJun 7, 22:20 UTC1h 25m
2026-06-07 UAL1188 RDM → DEN Jun 7, 18:00 UTCJun 7, 19:35 UTC1h 35m
2026-06-07 UAL2742 LAX → SFO Jun 7, 15:10 UTCJun 7, 16:20 UTC1h 10m
2026-06-06 UAL645 LAX → EWR Jun 6, 23:44 UTCJun 7, 00:55 UTC1h 10m
2026-06-06 UAL1235 DEN → DFW Jun 6, 20:22 UTCJun 6, 22:19 UTC1h 57m
2026-06-06 UAL1235 DEN → DFW Jun 6, 19:54 UTCJun 6, 20:05 UTC10m
2026-06-06 UAL1134 EWR → CUN Jun 6, 00:50 UTCJun 6, 02:55 UTC2h 5m
2026-06-05 UAL498 PDX → EWR Jun 5, 20:45 UTCJun 5, 22:40 UTC1h 55m
2026-06-05 UAL756 DEN → JAC Jun 5, 17:30 UTCJun 5, 19:15 UTC1h 45m
2026-06-05 UAL1235 DEN → DFW Jun 5, 13:05 UTCJun 5, 15:35 UTC2h 30m
2026-06-05 UAL1134 EWR → CUN Jun 5, 01:25 UTCJun 5, 03:40 UTC2h 15m
2026-06-04 UAL498 PDX → EWR Jun 4, 20:50 UTCJun 4, 23:00 UTC2h 10m
2026-06-04 UAL498 PDX → EWR Jun 4, 20:42 UTCJun 4, 22:52 UTC2h 10m
2026-06-04 UAL756 DEN → JAC Jun 4, 17:25 UTCJun 4, 19:10 UTC1h 45m
2026-06-04 UAL2838 HKG → SFO Jun 4, 14:30 UTCJun 4, 15:50 UTC1h 20m
2026-06-04 UAL1436 BOS → ORD Jun 4, 01:45 UTCJun 4, 02:50 UTC1h 5m
2026-06-03 UAL2187 SBA → SFO Jun 3, 23:45 UTCJun 4, 00:25 UTC40m
2026-06-03 UAL2187 SBA → SFO Jun 3, 20:10 UTCJun 3, 22:25 UTC2h 15m
2026-06-03 UAL2115 MIA → EWR Jun 3, 17:45 UTCJun 3, 18:40 UTC55m
2026-06-03 UAL790 DEN → AUS Jun 3, 12:30 UTCJun 3, 15:35 UTC3h 5m
2026-06-03 UAL1168 BZN → SFO Jun 3, 08:05 UTCJun 3, 11:10 UTC3h 5m
2026-06-03 UAL292 EWR → SEA Jun 3, 03:40 UTCJun 3, 06:55 UTC3h 15m
2026-06-02 UAL1116 BOS → ORD Jun 2, 20:42 UTCJun 3, 00:00 UTC3h 18m
2026-06-02 UAL1116 BOS → ORD Jun 2, 20:45 UTCJun 3, 00:00 UTC3h 15m
2026-06-02 UAL2386 EWR → TPA Jun 2, 18:25 UTCJun 2, 19:20 UTC55m

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 N493UA page for operator, model, and routing details .

Mode-S A61D00 frequently asked

What is Mode-S code A61D00?
A61D00 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N493UA.
Where is Mode-S A61D00 registered?
Mode-S code A61D00 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 A61D00 broadcasting right now?
Mode-S A61D00 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A61D00, octal 51416400, decimal 10,886,400.
What flights does A61D00 operate?
Mode-S A61D00 has broadcast 20 distinct callsigns, including UAL255, UAL1376, UAL1204, UAL636, UAL576.