Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
Broadcasting now · callsign UAL1937 · 28,825 ft
Flights observed
160
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Current position

A8FC73 is currently broadcasting. Map zoomed to live position.

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
UAL677 United Airlines 4 2026-05-28
UAL2163 United Airlines 4 2026-04-17
UAL538 United Airlines 3 2026-05-29
UAL1626 United Airlines 3 2026-05-28
UAL753 United Airlines 2 2026-05-19
UAL679 United Airlines 2 2026-04-26
UAL594 United Airlines 2 2026-04-16
UAL525 - 2 2026-04-17
UAL483 United Airlines 2 2026-06-02
UAL3889 United Airlines 2 2026-05-12
UAL3875 United Airlines 2 2026-04-16
UAL2863 United Airlines 2 2026-04-19
UAL279 United Airlines 2 2026-05-27
UAL2677 United Airlines 2 2026-04-16
UAL2662 United Airlines 2 2026-05-20
UAL2659 United Airlines 2 2026-04-19
UAL2610 United Airlines 2 2026-04-26
UAL2291 United Airlines 2 2026-05-23
UAL2277 United Airlines 2 2026-05-26
UAL2183 United Airlines 2 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 UAL1662 EWR → SFO Jun 2, 20:40 UTCJun 2, 21:40 UTC1h 0m
2026-06-02 UAL1963 IAH → BDL Jun 2, 18:07 UTCJun 2, 19:15 UTC1h 8m
2026-06-02 UAL1963 IAH → BDL Jun 2, 18:15 UTCJun 2, 19:20 UTC1h 5m
2026-06-02 UAL703 DEN → BIL Jun 2, 14:25 UTCJun 2, 16:25 UTC2h 0m
2026-06-02 UAL483 BNA → SFO Jun 2, 01:15 UTCJun 2, 04:15 UTC3h 0m
2026-06-02 UAL483 BNA → SFO Jun 2, 01:12 UTCJun 2, 04:05 UTC2h 53m
2026-06-01 UAL1019 CUN → IAH Jun 1, 22:00 UTCJun 1, 22:40 UTC40m
2026-06-01 UAL1016 IAH → CUN Jun 1, 17:20 UTCJun 1, 17:40 UTC20m
2026-06-01 UAL286 CLE → DEN Jun 1, 12:30 UTCJun 1, 14:05 UTC1h 35m
2026-06-01 UAL1261 EWR → IAH Jun 1, 03:25 UTCJun 1, 05:05 UTC1h 40m
2026-06-01 UAL2796 JAX → EWR Jun 1, 00:15 UTCJun 1, 02:10 UTC1h 55m
2026-05-31 UAL2678 ORD → SFO May 31, 20:55 UTCMay 31, 22:50 UTC1h 55m
2026-05-31 UAL1227 PHX → IAD May 31, 13:20 UTCMay 31, 15:40 UTC2h 20m
2026-05-30 UAL1900 COS → DEN May 30, 21:05 UTCMay 30, 23:15 UTC2h 10m
2026-05-30 UAL606 MCO → EWR May 30, 17:30 UTCMay 30, 19:10 UTC1h 40m
2026-05-30 UAL1577 RNO → SFO May 30, 14:25 UTCMay 30, 16:00 UTC1h 35m
2026-05-30 UAL2747 EWR → INT May 30, 01:45 UTCMay 30, 03:10 UTC1h 25m
2026-05-29 UAL538 EWR → BNA May 29, 22:50 UTCMay 29, 23:05 UTC15m
2026-05-29 UAL538 EWR → BNA May 29, 20:55 UTCMay 29, 23:05 UTC2h 10m
2026-05-29 UAL538 EWR → BNA May 29, 21:05 UTCMay 29, 22:34 UTC1h 29m
2026-05-29 UAL2774 NRT → SFO May 29, 17:55 UTCMay 29, 19:20 UTC1h 25m
2026-05-29 UAL2290 ORD → SFO May 29, 13:30 UTCMay 29, 15:25 UTC1h 55m
2026-05-29 UAL2078 BOS → ORD May 29, 07:10 UTCMay 29, 11:15 UTC4h 5m
2026-05-29 UAL1814 EWR → DFW May 29, 00:40 UTCMay 29, 05:25 UTC4h 45m
2026-05-28 UAL1626 ORD → DEN May 28, 20:10 UTCMay 28, 22:30 UTC2h 20m
2026-05-28 UAL677 ORD → BOS May 28, 15:50 UTCMay 28, 18:20 UTC2h 30m
2026-05-28 UAL284 AUS → EWR May 28, 12:20 UTCMay 28, 13:55 UTC1h 35m
2026-05-28 UAL1261 EWR → IAH May 28, 02:35 UTCMay 28, 04:45 UTC2h 10m
2026-05-27 UAL279 CLT → EWR May 27, 22:25 UTCMay 28, 01:00 UTC2h 35m
2026-05-27 UAL651 SAN → SFO May 27, 17:50 UTCMay 27, 20:55 UTC3h 5m
2026-05-27 UAL2394 BOS → EWR May 27, 15:05 UTCMay 27, 15:55 UTC50m
2026-05-27 UAL1110 IAD → SFO May 27, 12:45 UTCMay 27, 13:25 UTC40m
2026-05-27 UAL1833 MCO → EWR May 27, 10:20 UTCMay 27, 11:10 UTC50m
2026-05-26 UAL2161 EWR → MCO May 26, 22:15 UTCMay 27, 00:44 UTC2h 30m
2026-05-26 UAL1535 EWR → ORD May 26, 17:25 UTCMay 26, 20:15 UTC2h 50m
2026-05-26 UAL2277 ORD → SAT May 26, 13:10 UTCMay 26, 14:30 UTC1h 20m
2026-05-26 UAL2277 ORD → SAT May 26, 13:18 UTCMay 26, 14:28 UTC1h 10m
2026-05-25 UAL664 LAS → ORD May 25, 22:34 UTCMay 26, 01:34 UTC3h 0m
2026-05-24 UAL1448 SAN → SFO May 24, 23:00 UTCMay 24, 23:46 UTC46m
2026-05-24 UAL1051 CUN → EWR May 24, 19:10 UTCMay 24, 21:15 UTC2h 5m
2026-05-24 UAL1018 SJC → IAH May 24, 15:35 UTCMay 24, 17:35 UTC2h 0m
2026-05-24 UAL468 SFO → LAS May 24, 11:10 UTCMay 24, 13:30 UTC2h 20m
2026-05-23 UAL2381 MSY → IAD May 23, 22:55 UTCMay 24, 01:05 UTC2h 10m
2026-05-23 UAL1643 RIC → DEN May 23, 18:25 UTCMay 23, 20:50 UTC2h 25m
2026-05-23 UAL1739 EWR → MCO May 23, 14:10 UTCMay 23, 16:15 UTC2h 5m
2026-05-23 UAL2828 AMS → SFO May 23, 11:00 UTCMay 23, 12:30 UTC1h 30m
2026-05-23 UAL2291 IAH → ATL May 23, 01:54 UTCMay 23, 03:30 UTC1h 36m
2026-05-23 UAL2291 IAH → ATL May 23, 01:50 UTCMay 23, 03:35 UTC1h 45m
2026-05-22 UAL1395 IAD → BDL May 22, 21:45 UTCMay 23, 00:05 UTC2h 20m
2026-05-22 UAL1797 RDU → EWR May 22, 17:29 UTCMay 22, 19:55 UTC2h 26m

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?
Yes. Mode-S A8FC73 is currently airborne.
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 UAL677, UAL2163, UAL538, UAL1626, UAL753.