Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A448F8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N37516 · BOEING 737 MAX 9 · operated by WILMINGTON TRUST CO TRUSTEE

Hex
A448F8
Octal
51044370
Decimal
10,766,584
Country
US
Tail
N37516
Type
B39M
No current signal · last broadcast Jul 26, 21:05 UTC
Flights observed
419
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:05 UTC

Last known position

Most recent position reported by Mode-S A448F8.

Country allocation

The ICAO 24-bit address A448F8 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
UAL1797 United Airlines 5 2026-05-12
UAL676 United Airlines 4 2026-05-12
UAL2419 United Airlines 4 2026-05-18
UAL1745 - 4 2026-06-14
UAL1698 United Airlines 4 2026-04-16
UAL1497 - 4 2026-07-15
UAL1458 United Airlines 4 2026-07-25
UAL1194 - 4 2026-07-25
UAL8130 United Airlines 3 2026-05-16
UAL709 United Airlines 3 2026-05-27
UAL582 United Airlines 3 2026-04-16
UAL337 - 3 2026-07-10
UAL312 - 3 2026-06-28
UAL2740 - 3 2026-07-13
UAL2661 - 3 2026-07-11
UAL2383 United Airlines 3 2026-04-14
UAL2380 - 3 2026-07-11
UAL2330 - 3 2026-06-30
UAL2019 United Airlines 3 2026-06-12
UAL1987 - 3 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1892 DEN → BOS Jul 26, 20:00 UTCJul 26, 21:05 UTC1h 5m
2026-07-26 UAL486 CLE → DEN Jul 26, 15:50 UTCJul 26, 17:45 UTC1h 55m
2026-07-26 UAL2636 - Jul 26, 12:00 UTCJul 26, 13:50 UTC1h 50m
2026-07-26 UAL2131 PBI → EWR Jul 26, 03:35 UTCJul 26, 04:30 UTC55m
2026-07-25 UAL1458 LGA → IAH Jul 25, 19:55 UTCJul 25, 23:35 UTC3h 40m
2026-07-25 UAL1458 LGA → IAH Jul 25, 19:33 UTCJul 25, 23:35 UTC4h 2m
2026-07-25 UAL1194 IAD → SAL Jul 25, 13:08 UTCJul 25, 16:57 UTC3h 49m
2026-07-25 UAL1194 - Jul 25, 13:05 UTCJul 25, 16:45 UTC3h 40m
2026-07-25 UAL8141 SAN → EWR Jul 25, 06:30 UTCJul 25, 11:00 UTC4h 30m
2026-07-24 UAL2810 MIA → SFO Jul 24, 23:50 UTCJul 25, 04:55 UTC5h 5m
2026-07-24 UAL2029 ORD → RIC Jul 24, 16:15 UTCJul 24, 21:25 UTC5h 10m
2026-07-24 UAL2363 PHL → ORD Jul 24, 13:15 UTCJul 24, 14:20 UTC1h 5m
2026-07-24 UAL2363 PHL → ORD Jul 24, 13:14 UTCJul 24, 14:15 UTC1h 1m
2026-07-24 UAL552 SFO → LAX Jul 24, 04:40 UTCJul 24, 05:35 UTC55m
2026-07-23 UAL2462 YVR → SFO Jul 23, 22:01 UTCJul 24, 02:44 UTC4h 43m
2026-07-23 UAL2462 YVR → SFO Jul 23, 22:00 UTCJul 24, 02:45 UTC4h 45m
2026-07-23 UAL608 IAD → EWR Jul 23, 15:20 UTCJul 23, 18:00 UTC2h 40m
2026-07-23 UAL608 IAD → EWR Jul 23, 15:32 UTCJul 23, 19:37 UTC4h 5m
2026-07-23 UAL2367 PIT → SFO Jul 23, 11:30 UTCJul 23, 13:40 UTC2h 10m
2026-07-23 UAL1662 EWR → SFO Jul 23, 01:55 UTCJul 23, 02:55 UTC1h 0m
2026-07-22 UAL1963 DEN → SLC Jul 22, 18:00 UTCJul 22, 19:10 UTC1h 10m
2026-07-22 UAL2412 DEN → MSP Jul 22, 12:55 UTCJul 22, 16:40 UTC3h 45m
2026-07-21 UAL1093 - Jul 21, 17:35 UTCJul 21, 22:20 UTC4h 45m
2026-07-21 UAL325 DEN → BOS Jul 21, 11:10 UTCJul 21, 15:55 UTC4h 45m
2026-07-20 UAL1458 LGA → IAH Jul 20, 19:40 UTCJul 20, 23:30 UTC3h 50m
2026-07-20 UAL1194 - Jul 20, 13:30 UTCJul 20, 17:20 UTC3h 50m
2026-07-20 UAL349 CZM → ORD Jul 20, 06:25 UTCJul 20, 11:05 UTC4h 40m
2026-07-19 UAL2755 LAX → SFO Jul 19, 23:55 UTCJul 20, 02:55 UTC3h 0m
2026-07-19 UAL2755 LAX → SFO Jul 19, 23:54 UTCJul 20, 02:59 UTC3h 5m
2026-07-19 UAL3914 - Jul 19, 19:05 UTCJul 19, 20:55 UTC1h 50m
2026-07-18 UAL1016 IAH → CUN Jul 18, 17:15 UTCJul 18, 19:00 UTC1h 45m
2026-07-18 UAL1016 IAH → CUN Jul 18, 17:12 UTCJul 18, 18:57 UTC1h 45m
2026-07-18 UAL1467 - Jul 18, 12:30 UTCJul 18, 13:25 UTC55m
2026-07-18 UAL1467 SAL → IAH Jul 18, 12:16 UTCJul 18, 14:47 UTC2h 31m
2026-07-18 UAL1467 SAL → IAH Jul 18, 12:16 UTCJul 18, 14:55 UTC2h 39m
2026-07-18 UAL1266 - Jul 18, 06:05 UTCJul 18, 10:25 UTC4h 20m
2026-07-18 UAL298 AUS → EWR Jul 18, 03:10 UTCJul 18, 04:10 UTC1h 0m
2026-07-18 UAL233 - Jul 18, 00:39 UTCJul 18, 01:34 UTC55m
2026-07-18 UAL233 LAX → SFO Jul 18, 00:26 UTCJul 18, 01:29 UTC1h 3m
2026-07-17 UAL2610 - Jul 17, 22:05 UTCJul 17, 23:00 UTC55m
2026-07-17 UAL1791 - Jul 17, 19:35 UTCJul 17, 20:25 UTC50m
2026-07-17 UAL1791 LAX → SFO Jul 17, 19:34 UTCJul 17, 20:24 UTC50m
2026-07-17 UAL360 DFW → EWR Jul 17, 10:35 UTCJul 17, 15:55 UTC5h 20m
2026-07-16 UAL1372 - Jul 16, 20:45 UTCJul 17, 01:45 UTC5h 0m
2026-07-16 UAL1372 SFO → BOS Jul 16, 19:47 UTCJul 17, 01:46 UTC5h 59m
2026-07-16 UAL323 BOS → SFO Jul 16, 11:34 UTCJul 16, 17:14 UTC5h 40m
2026-07-16 UAL521 - Jul 16, 00:30 UTCJul 16, 03:45 UTC3h 15m
2026-07-15 UAL1019 - Jul 15, 20:35 UTCJul 15, 22:30 UTC1h 55m
2026-07-15 UAL1016 - Jul 15, 17:10 UTCJul 15, 19:00 UTC1h 50m
2026-07-15 UAL1644 - Jul 15, 11:20 UTCJul 15, 15:30 UTC4h 10m

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 N37516 page for operator, model, and routing details .

Mode-S A448F8 frequently asked

What is Mode-S code A448F8?
A448F8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N37516.
Where is Mode-S A448F8 registered?
Mode-S code A448F8 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 A448F8 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A448F8, octal 51044370, decimal 10,766,584.
What flights does A448F8 operate?
Mode-S A448F8 has broadcast 20 distinct callsigns, including UAL1797, UAL676, UAL2419, UAL1745, UAL1698.