Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A448D5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N37506 · BOEING 737 MAX 9 · operated by UNITED AIRLINES INC

Hex
A448D5
Octal
51044325
Decimal
10,766,549
Country
US
Tail
N37506
Type
B39M
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
364
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S A448D5.

Country allocation

The ICAO 24-bit address A448D5 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
UAL1466 United Airlines 5 2026-07-25
UAL1052 - 5 2026-07-02
UAL1397 - 4 2026-07-17
UAL1040 - 4 2026-06-26
UAL1039 United Airlines 4 2026-04-28
UAL462 - 3 2026-06-17
UAL427 - 3 2026-06-26
UAL392 - 3 2026-06-20
UAL277 - 3 2026-06-16
UAL2624 United Airlines 3 2026-07-25
UAL2600 United Airlines 3 2026-06-16
UAL2474 - 3 2026-07-14
UAL2237 United Airlines 3 2026-06-05
UAL2132 United Airlines 3 2026-07-26
UAL2024 United Airlines 3 2026-05-22
UAL2022 United Airlines 3 2026-04-25
UAL1988 - 3 2026-04-13
UAL1948 - 3 2026-07-02
UAL1803 United Airlines 3 2026-05-29
UAL1760 - 3 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1708 MCO → EWR Jul 26, 20:20 UTCJul 26, 21:15 UTC55m
2026-07-26 UAL1330 EWR → SAV Jul 26, 13:15 UTCJul 26, 18:50 UTC5h 35m
2026-07-26 UAL2132 MSP → EWR Jul 26, 06:15 UTCJul 26, 11:00 UTC4h 46m
2026-07-25 UAL2624 LGA → DEN Jul 25, 23:00 UTCJul 26, 04:15 UTC5h 15m
2026-07-25 UAL1466 PLS → EWR Jul 25, 12:45 UTCJul 25, 20:15 UTC7h 30m
2026-07-24 UAL1614 PHL → ORD Jul 24, 20:18 UTCJul 24, 23:42 UTC3h 24m
2026-07-24 UAL1270 ORD → PUJ Jul 24, 14:15 UTCJul 24, 23:45 UTC9h 30m
2026-07-23 UAL1667 CUN → ORD Jul 23, 20:50 UTCJul 24, 00:15 UTC3h 25m
2026-07-23 UAL1659 JAX → EWR Jul 23, 15:55 UTCJul 23, 17:15 UTC1h 20m
2026-07-23 UAL1659 JAX → EWR Jul 23, 16:04 UTCJul 23, 18:52 UTC2h 48m
2026-07-23 UAL1150 PHX → EWR Jul 23, 11:20 UTCJul 23, 14:05 UTC2h 45m
2026-07-22 UAL1213 EWR → ATL Jul 22, 22:15 UTCJul 23, 00:30 UTC2h 15m
2026-07-22 UAL3025 EWR → SFO Jul 22, 13:55 UTCJul 22, 17:05 UTC3h 10m
2026-07-21 UAL3025 EWR → SFO Jul 21, 19:20 UTCJul 22, 17:05 UTC21h 45m
2026-07-21 UAL1624 EWR → STI Jul 21, 18:20 UTCJul 22, 17:05 UTC22h 45m
2026-07-21 UAL1041 SAN → EWR Jul 21, 11:20 UTCJul 21, 13:40 UTC2h 20m
2026-07-20 UAL8118 - Jul 20, 18:00 UTCJul 20, 23:00 UTC5h 0m
2026-07-20 UAL2441 BOS → SFO Jul 20, 10:40 UTCJul 20, 16:15 UTC5h 35m
2026-07-19 UAL521 JFK → SFO Jul 19, 23:35 UTCJul 20, 03:20 UTC3h 45m
2026-07-19 UAL1976 BOS → IAH Jul 19, 18:00 UTCJul 19, 21:30 UTC3h 30m
2026-07-19 UAL1977 - Jul 19, 12:50 UTCJul 19, 16:10 UTC3h 20m
2026-07-18 UAL1130 SAL → IAH Jul 18, 22:05 UTCJul 19, 00:30 UTC2h 25m
2026-07-18 UAL1130 SAL → IAH Jul 18, 21:52 UTCJul 19, 00:30 UTC2h 38m
2026-07-18 UAL1290 IAH → SAL Jul 18, 17:50 UTCJul 18, 18:15 UTC25m
2026-07-18 UAL1290 IAH → SAL Jul 18, 17:47 UTCJul 18, 20:16 UTC2h 29m
2026-07-18 UAL1644 SJU → IAH Jul 18, 12:55 UTCJul 18, 15:15 UTC2h 20m
2026-07-18 UAL1644 SJU → IAH Jul 18, 11:10 UTCJul 18, 11:20 UTC10m
2026-07-18 UAL1497 - Jul 18, 09:05 UTCJul 18, 09:15 UTC10m
2026-07-18 UAL1497 - Jul 18, 05:10 UTCJul 18, 07:25 UTC2h 15m
2026-07-18 UAL265 - Jul 18, 00:39 UTCJul 18, 03:40 UTC3h 1m
2026-07-17 UAL1397 - Jul 17, 19:05 UTCJul 17, 22:00 UTC2h 55m
2026-07-17 UAL1397 IAH → EWR Jul 17, 19:08 UTCJul 17, 21:57 UTC2h 49m
2026-07-17 UAL1249 PTY → IAH Jul 17, 13:19 UTCJul 17, 16:41 UTC3h 22m
2026-07-16 UAL1249 - Jul 16, 19:55 UTCJul 17, 16:44 UTC20h 50m
2026-07-16 UAL2638 - Jul 16, 16:00 UTCJul 16, 18:15 UTC2h 15m
2026-07-16 UAL1150 MCO → ORD Jul 16, 11:15 UTCJul 16, 13:45 UTC2h 30m
2026-07-15 UAL1213 EWR → MCO Jul 15, 19:25 UTCJul 15, 21:35 UTC2h 10m
2026-07-15 UAL371 - Jul 15, 12:25 UTCJul 15, 14:15 UTC1h 50m
2026-07-15 UAL1261 SAT → EWR Jul 15, 01:54 UTCJul 15, 03:24 UTC1h 30m
2026-07-15 UAL1261 - Jul 15, 01:45 UTCJul 15, 03:20 UTC1h 35m
2026-07-14 UAL1501 TPA → EWR Jul 14, 21:45 UTCJul 15, 00:10 UTC2h 24m
2026-07-14 UAL2776 EWR → TPA Jul 14, 17:50 UTCJul 14, 20:00 UTC2h 10m
2026-07-14 UAL1437 CMH → ORD Jul 14, 11:25 UTCJul 14, 13:55 UTC2h 30m
2026-07-14 UAL2474 - Jul 14, 04:20 UTCJul 14, 05:10 UTC50m
2026-07-14 UAL2114 - Jul 14, 02:05 UTCJul 14, 02:50 UTC45m
2026-07-13 UAL1590 - Jul 13, 20:00 UTCJul 13, 22:50 UTC2h 50m
2026-07-13 UAL2080 - Jul 13, 15:20 UTCJul 13, 17:55 UTC2h 35m
2026-07-13 UAL2785 EWR → MIA Jul 13, 11:10 UTCJul 13, 13:40 UTC2h 30m
2026-07-13 UAL1703 PTY → EWR Jul 13, 04:09 UTCJul 13, 08:37 UTC4h 28m
2026-07-12 UAL1021 EWR → EWR Jul 12, 19:45 UTCJul 13, 08:40 UTC12h 55m

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 N37506 page for operator, model, and routing details .

Mode-S A448D5 frequently asked

What is Mode-S code A448D5?
A448D5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N37506.
Where is Mode-S A448D5 registered?
Mode-S code A448D5 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 A448D5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A448D5, octal 51044325, decimal 10,766,549.
What flights does A448D5 operate?
Mode-S A448D5 has broadcast 20 distinct callsigns, including UAL1466, UAL1052, UAL1397, UAL1040, UAL1039.