Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A76F48

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N57857 · BOEING 757-300 · operated by UNITED AIRLINES INC

Hex
A76F48
Octal
51667510
Decimal
10,973,000
Country
US
Tail
N57857
Type
B753
Broadcasting now · callsign UAL1719 · 1,025 ft
Flights observed
272
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Current position

A76F48 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A76F48 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
UAL1224 - 24 2026-07-06
UAL1636 - 22 2026-07-07
UAL1431 - 11 2026-07-03
UAL1718 - 8 2026-07-14
UAL2292 United Airlines 7 2026-05-17
UAL1719 - 7 2026-07-14
UAL1221 United Airlines 7 2026-07-04
UAL2814 - 6 2026-07-08
UAL1734 United Airlines 6 2026-05-08
UAL599 - 5 2026-06-17
UAL501 - 5 2026-06-20
UAL373 United Airlines 5 2026-06-13
UAL2268 - 5 2026-07-09
UAL2087 United Airlines 5 2026-06-03
UAL1946 United Airlines 5 2026-05-10
UAL1941 - 5 2026-07-07
UAL1022 United Airlines 5 2026-06-20
UAL531 United Airlines 4 2026-05-17
UAL2282 - 4 2026-07-03
UAL1722 United Airlines 4 2026-05-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL1719 - Jul 14, 08:25 UTCJul 14, 08:35 UTC10m
2026-07-14 UAL1718 - Jul 14, 05:30 UTCJul 14, 05:35 UTC5m
2026-07-14 UAL1718 - Jul 14, 00:40 UTCJul 14, 01:10 UTC30m
2026-07-09 UAL2276 - Jul 9, 22:55 UTCJul 10, 03:35 UTC4h 40m
2026-07-09 UAL2268 - Jul 9, 15:30 UTCJul 9, 20:00 UTC4h 30m
2026-07-08 UAL2814 - Jul 8, 14:35 UTCJul 8, 18:10 UTC3h 35m
2026-07-08 UAL1375 JAX → EWR Jul 8, 02:08 UTCJul 8, 05:17 UTC3h 9m
2026-07-08 UAL1375 JAX → EWR Jul 8, 02:00 UTCJul 8, 05:30 UTC3h 30m
2026-07-07 UAL1577 ORD → SFO Jul 7, 19:55 UTCJul 7, 23:45 UTC3h 50m
2026-07-07 UAL1941 - Jul 7, 14:20 UTCJul 7, 17:50 UTC3h 30m
2026-07-07 UAL1636 - Jul 7, 05:50 UTCJul 7, 06:35 UTC45m
2026-07-07 UAL1636 - Jul 7, 01:30 UTCJul 7, 01:50 UTC20m
2026-07-06 UAL1224 - Jul 6, 23:20 UTCJul 6, 23:35 UTC15m
2026-07-06 UAL1224 - Jul 6, 18:40 UTCJul 6, 19:05 UTC25m
2026-07-06 UAL1224 LAX → HNL Jul 6, 18:35 UTCJul 6, 23:43 UTC5h 8m
2026-07-06 UAL2276 IAD → LAX Jul 6, 01:59 UTCJul 6, 08:46 UTC6h 47m
2026-07-06 UAL2276 IAD → LAX Jul 6, 03:45 UTCJul 6, 08:45 UTC5h 0m
2026-07-05 UAL2268 - Jul 5, 16:05 UTCJul 5, 20:40 UTC4h 35m
2026-07-05 UAL1719 - Jul 5, 12:15 UTCJul 5, 12:50 UTC35m
2026-07-05 UAL1719 - Jul 5, 08:20 UTCJul 5, 08:25 UTC5m
2026-07-05 UAL1718 - Jul 5, 05:30 UTCJul 5, 05:35 UTC5m
2026-07-05 UAL1718 - Jul 5, 00:15 UTCJul 5, 00:45 UTC30m
2026-07-04 UAL1221 PDX → EWR Jul 4, 17:20 UTCJul 4, 21:50 UTC4h 30m
2026-07-03 UAL1431 - Jul 3, 20:35 UTCJul 3, 21:35 UTC1h 0m
2026-07-03 UAL1431 LAX → HNL Jul 3, 20:33 UTCJul 4, 01:55 UTC5h 22m
2026-07-03 UAL1868 - Jul 3, 13:15 UTCJul 3, 18:05 UTC4h 50m
2026-07-03 UAL2282 - Jul 3, 07:25 UTCJul 3, 11:45 UTC4h 20m
2026-07-02 UAL1636 - Jul 2, 03:50 UTCJul 2, 08:40 UTC4h 50m
2026-07-01 UAL1224 - Jul 1, 23:40 UTCJul 2, 00:00 UTC20m
2026-07-01 UAL1224 - Jul 1, 18:25 UTCJul 1, 19:30 UTC1h 5m
2026-07-01 UAL1224 LAX → HNL Jul 1, 18:25 UTCJul 1, 23:58 UTC5h 33m
2026-07-01 UAL1636 - Jul 1, 05:25 UTCJul 1, 06:15 UTC50m
2026-07-01 UAL1636 - Jul 1, 01:30 UTCJul 1, 01:45 UTC15m
2026-06-30 UAL1224 LAX → HNL Jun 30, 18:25 UTCJun 30, 23:32 UTC5h 7m
2026-06-30 UAL1224 - Jun 30, 18:35 UTCJun 30, 23:45 UTC5h 10m
2026-06-30 UAL1636 - Jun 30, 05:35 UTCJun 30, 06:25 UTC50m
2026-06-30 UAL1636 - Jun 30, 01:30 UTCJun 30, 01:45 UTC15m
2026-06-30 UAL1636 HNL → LAX Jun 30, 01:33 UTCJun 30, 06:21 UTC4h 48m
2026-06-29 UAL1224 - Jun 29, 18:25 UTCJun 29, 23:44 UTC5h 20m
2026-06-29 UAL1636 - Jun 29, 02:05 UTCJun 29, 06:54 UTC4h 50m
2026-06-28 UAL1224 - Jun 28, 18:40 UTCJun 28, 23:44 UTC5h 5m
2026-06-28 UAL1636 - Jun 28, 06:00 UTCJun 28, 06:40 UTC40m
2026-06-28 UAL1636 - Jun 28, 01:34 UTCJun 28, 01:44 UTC10m
2026-06-27 UAL1224 - Jun 27, 18:45 UTCJun 27, 23:34 UTC4h 50m
2026-06-27 UAL1224 LAX → HNL Jun 27, 18:25 UTCJun 27, 23:33 UTC5h 8m
2026-06-26 UAL1967 DEN → MSN Jun 26, 23:55 UTCJun 27, 03:40 UTC3h 45m
2026-06-26 UAL1954 SFO → ORD Jun 26, 18:24 UTCJun 26, 21:50 UTC3h 25m
2026-06-26 UAL246 - Jun 26, 11:30 UTCJun 26, 15:29 UTC4h 0m
2026-06-26 UAL1777 - Jun 26, 01:54 UTCJun 26, 02:00 UTC5m
2026-06-25 UAL1777 SFO → ORD Jun 25, 22:20 UTCJun 26, 02:00 UTC3h 40m

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 N57857 page for operator, model, and routing details .

Mode-S A76F48 frequently asked

What is Mode-S code A76F48?
A76F48 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N57857.
Where is Mode-S A76F48 registered?
Mode-S code A76F48 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 A76F48 broadcasting right now?
Yes. Mode-S A76F48 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A76F48, octal 51667510, decimal 10,973,000.
What flights does A76F48 operate?
Mode-S A76F48 has broadcast 20 distinct callsigns, including UAL1224, UAL1636, UAL1431, UAL1718, UAL2292.