Apparatus

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sensors Mode-S transponder

A8FC73

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N67846 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A8FC73
Octal
52176163
Decimal
11,074,675
Country
US
Tail
N67846
Type
B739
Transponder active on ground
Flights observed
365
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A8FC73.

Country allocation

The ICAO 24-bit address A8FC73 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
UAL1576 - 7 2026-07-17
UAL677 - 6 2026-06-26
UAL1302 - 6 2026-07-16
UAL1623 United Airlines 5 2026-06-03
UAL1587 - 5 2026-07-12
UAL2163 United Airlines 4 2026-04-17
UAL679 - 3 2026-06-21
UAL538 United Airlines 3 2026-05-29
UAL2381 United Airlines 3 2026-06-11
UAL2129 - 3 2026-07-03
UAL1976 - 3 2026-07-16
UAL1957 - 3 2026-06-15
UAL1872 United Airlines 3 2026-06-12
UAL1695 - 3 2026-07-04
UAL1626 United Airlines 3 2026-05-28
UAL1520 - 3 2026-06-24
UAL1281 - 3 2026-07-15
UAL1051 - 3 2026-07-06
UAL780 - 2 2026-06-18
UAL764T United Airlines 2 2026-06-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 UAL1524 IAH → EWR Jul 18, 10:15 UTCJul 18, 10:50 UTC35m
2026-07-18 UAL8177 IAD → ORF Jul 18, 03:30 UTCJul 18, 04:05 UTC35m
2026-07-17 UAL1576 - Jul 17, 21:20 UTCJul 17, 23:14 UTC1h 55m
2026-07-17 UAL1576 EWR → TPA Jul 17, 13:20 UTCJul 17, 15:29 UTC2h 10m
2026-07-17 UAL2147 MIA → EWR Jul 17, 10:44 UTCJul 17, 11:25 UTC40m
2026-07-17 UAL1373 - Jul 17, 00:25 UTCJul 17, 02:59 UTC2h 35m
2026-07-16 UAL1976 - Jul 16, 17:54 UTCJul 16, 21:19 UTC3h 25m
2026-07-16 UAL1977 - Jul 16, 12:55 UTCJul 16, 16:09 UTC3h 15m
2026-07-16 UAL505 - Jul 16, 07:20 UTCJul 16, 10:45 UTC3h 25m
2026-07-16 UAL1302 - Jul 16, 02:35 UTCJul 16, 03:45 UTC1h 10m
2026-07-15 UAL1281 DEN → SAN Jul 15, 23:30 UTCJul 16, 01:20 UTC1h 50m
2026-07-15 UAL1248 DEN → DEN Jul 15, 17:50 UTCJul 15, 22:00 UTC4h 10m
2026-07-15 UAL1029 - Jul 15, 14:50 UTCJul 15, 16:00 UTC1h 10m
2026-07-15 UAL1937 - Jul 15, 00:00 UTCJul 15, 01:10 UTC1h 10m
2026-07-14 UAL1436 DEN → DEN Jul 14, 17:50 UTCJul 14, 22:25 UTC4h 35m
2026-07-14 UAL2816 - Jul 14, 14:05 UTCJul 14, 16:05 UTC2h 0m
2026-07-14 UAL2816 IAH → DEN Jul 14, 13:47 UTCJul 14, 16:01 UTC2h 14m
2026-07-14 UAL387 - Jul 14, 03:10 UTCJul 14, 06:00 UTC2h 50m
2026-07-13 UAL1689 - Jul 13, 18:35 UTCJul 13, 23:00 UTC4h 25m
2026-07-13 UAL1549 - Jul 13, 14:45 UTCJul 13, 17:15 UTC2h 30m
2026-07-13 UAL2310 - Jul 13, 10:40 UTCJul 13, 12:40 UTC2h 0m
2026-07-13 UAL1411 DEN → ORD Jul 13, 00:10 UTCJul 13, 02:25 UTC2h 15m
2026-07-12 UAL1587 IAD → DEN Jul 12, 18:45 UTCJul 12, 21:40 UTC2h 55m
2026-07-12 UAL1587 IAD → DEN Jul 12, 18:41 UTCJul 12, 21:37 UTC2h 56m
2026-07-12 UAL2057 IAD → MCI Jul 12, 16:18 UTCJul 12, 17:15 UTC57m
2026-07-12 UAL2057 SAV → IAD Jul 12, 16:05 UTCJul 12, 17:20 UTC1h 15m
2026-07-12 UAL2244 IAD → SAV Jul 12, 13:15 UTCJul 12, 14:25 UTC1h 10m
2026-07-12 UAL635 - Jul 12, 10:15 UTCJul 12, 11:15 UTC1h 0m
2026-07-12 UAL635 BDL → IAD Jul 12, 10:14 UTCJul 12, 11:14 UTC1h 0m
2026-07-12 UAL444 IAD → BDL Jul 12, 03:15 UTCJul 12, 04:05 UTC50m
2026-07-11 UAL1997 MCO → IAD Jul 11, 23:20 UTCJul 12, 01:10 UTC1h 50m
2026-07-11 UAL1101 IAD → MCO Jul 11, 19:50 UTCJul 11, 21:45 UTC1h 55m
2026-07-11 UAL2054 RSW → IAD Jul 11, 16:00 UTCJul 11, 18:00 UTC2h 0m
2026-07-11 UAL1406 IAD → RSW Jul 11, 12:40 UTCJul 11, 14:45 UTC2h 5m
2026-07-11 UAL357 - Jul 11, 05:10 UTCJul 11, 09:40 UTC4h 30m
2026-07-11 UAL1302 - Jul 11, 01:50 UTCJul 11, 03:01 UTC1h 10m
2026-07-10 UAL1281 DEN → SAN Jul 10, 22:45 UTCJul 11, 00:40 UTC1h 55m
2026-07-10 UAL1587 IAD → DEN Jul 10, 17:00 UTCJul 10, 20:10 UTC3h 10m
2026-07-10 UAL1587 IAD → DEN Jul 10, 17:04 UTCJul 10, 20:05 UTC3h 1m
2026-07-10 UAL1279 DEN → IAD Jul 10, 12:25 UTCJul 10, 15:20 UTC2h 55m
2026-07-10 UAL2339 - Jul 10, 02:05 UTCJul 10, 04:40 UTC2h 35m
2026-07-09 UAL489 - Jul 9, 22:35 UTCJul 10, 00:30 UTC1h 55m
2026-07-09 UAL1195 - Jul 9, 18:55 UTCJul 9, 20:05 UTC1h 10m
2026-07-09 UAL361 DEN → OMA Jul 9, 16:20 UTCJul 9, 17:30 UTC1h 10m
2026-07-09 UAL2648 - Jul 9, 12:15 UTCJul 9, 14:30 UTC2h 15m
2026-07-09 UAL2648 GRR → DEN Jul 9, 12:16 UTCJul 9, 14:36 UTC2h 20m
2026-07-09 UAL2121 DEN → GRR Jul 9, 06:20 UTCJul 9, 08:55 UTC2h 35m
2026-07-08 UAL2258 DEN → DEN Jul 8, 18:25 UTCJul 9, 01:45 UTC7h 20m
2026-07-08 UAL703 LAX → DEN Jul 8, 14:15 UTCJul 8, 16:05 UTC1h 50m
2026-07-08 UAL2179 - Jul 8, 06:00 UTCJul 8, 06:55 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 N67846 page for operator, model, and routing details .

Mode-S A8FC73 frequently asked

What is Mode-S code A8FC73?
A8FC73 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N67846.
Where is Mode-S A8FC73 registered?
Mode-S code A8FC73 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 A8FC73 broadcasting right now?
Mode-S A8FC73 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 A8FC73, octal 52176163, decimal 11,074,675.
What flights does A8FC73 operate?
Mode-S A8FC73 has broadcast 20 distinct callsigns, including UAL1576, UAL677, UAL1302, UAL1623, UAL1587.