Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A2615E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N25201 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
A2615E
Octal
50460536
Decimal
10,641,758
Country
US
Tail
N25201
Type
B738
No current signal · last broadcast Jul 26, 21:25 UTC
Flights observed
468
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:25 UTC

Last known position

Most recent position reported by Mode-S A2615E.

Country allocation

The ICAO 24-bit address A2615E 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
UAL2052 United Airlines 7 2026-06-19
UAL1156 - 6 2026-07-12
UAL1989 - 5 2026-06-15
UAL1126 - 5 2026-06-19
UAL623 United Airlines 4 2026-07-21
UAL499 United Airlines 4 2026-05-15
UAL475 United Airlines 4 2026-05-28
UAL360 United Airlines 4 2026-05-15
UAL2745 - 4 2026-06-23
UAL2048 United Airlines 4 2026-06-13
UAL1816 United Airlines 4 2026-07-25
UAL1781 United Airlines 4 2026-05-16
UAL1325 United Airlines 4 2026-05-22
UAL791 United Airlines 3 2026-07-19
UAL687 United Airlines 3 2026-05-29
UAL586 - 3 2026-06-23
UAL2857 United Airlines 3 2026-06-10
UAL2668 United Airlines 3 2026-05-22
UAL2424 United Airlines 3 2026-05-10
UAL2414 United Airlines 3 2026-06-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1093 LAX → SFO Jul 26, 16:55 UTCJul 26, 21:25 UTC4h 30m
2026-07-26 UAL2655 ORD → PHL Jul 26, 14:25 UTCJul 26, 15:10 UTC45m
2026-07-26 UAL2655 ORD → PHL Jul 26, 14:15 UTCJul 26, 15:04 UTC49m
2026-07-26 UAL1371 SNA → ORD Jul 26, 01:55 UTCJul 26, 04:00 UTC2h 5m
2026-07-26 UAL1371 SNA → ORD Jul 26, 01:50 UTCJul 26, 04:09 UTC2h 19m
2026-07-25 UAL2757 IAD → SFO Jul 25, 21:30 UTCJul 26, 00:30 UTC3h 0m
2026-07-25 UAL1003 DFW → EWR Jul 25, 16:25 UTCJul 25, 19:20 UTC2h 55m
2026-07-25 UAL1522 FLL → EWR Jul 25, 12:05 UTCJul 25, 14:20 UTC2h 15m
2026-07-25 UAL1816 DEN → CLE Jul 25, 02:00 UTCJul 25, 04:15 UTC2h 15m
2026-07-24 UAL2757 IAD → SFO Jul 24, 20:55 UTCJul 25, 00:05 UTC3h 10m
2026-07-24 UAL1003 DFW → EWR Jul 24, 16:15 UTCJul 24, 19:05 UTC2h 50m
2026-07-24 UAL337 DEN → DFW Jul 24, 13:10 UTCJul 24, 14:35 UTC1h 25m
2026-07-24 UAL1236 EWR → PHX Jul 24, 04:25 UTCJul 24, 05:45 UTC1h 20m
2026-07-24 UAL2786 GEG → DEN Jul 24, 01:30 UTCJul 24, 01:55 UTC25m
2026-07-24 UAL2786 GEG → DEN Jul 24, 00:10 UTCJul 24, 00:30 UTC20m
2026-07-23 UAL324 DEN → GEG Jul 23, 20:05 UTCJul 23, 21:55 UTC1h 50m
2026-07-23 UAL1191 COS → DEN Jul 23, 16:20 UTCJul 23, 18:10 UTC1h 50m
2026-07-23 UAL2411 MSO → DEN Jul 23, 02:00 UTCJul 23, 04:10 UTC2h 10m
2026-07-22 UAL2012 PTY → EWR Jul 22, 20:45 UTCJul 23, 00:20 UTC3h 35m
2026-07-22 UAL2012 PTY → EWR Jul 22, 20:34 UTCJul 23, 00:23 UTC3h 49m
2026-07-22 UAL1362 DEN → BWI Jul 22, 16:10 UTCJul 22, 19:05 UTC2h 55m
2026-07-22 UAL1362 DEN → BWI Jul 22, 16:07 UTCJul 22, 19:03 UTC2h 56m
2026-07-22 UAL596 - Jul 22, 12:30 UTCJul 22, 13:55 UTC1h 25m
2026-07-21 UAL1215 - Jul 21, 22:25 UTCJul 22, 01:35 UTC3h 10m
2026-07-21 UAL493 CLE → IAD Jul 21, 18:45 UTCJul 21, 19:45 UTC1h 0m
2026-07-21 UAL2849 EWR → DOM Jul 21, 16:05 UTCJul 21, 16:50 UTC45m
2026-07-21 UAL623 LGA → ORD Jul 21, 12:26 UTCJul 21, 14:23 UTC1h 57m
2026-07-21 UAL623 LGA → ORD Jul 21, 12:25 UTCJul 21, 14:30 UTC2h 5m
2026-07-21 UAL1655 - Jul 21, 02:00 UTCJul 21, 03:35 UTC1h 35m
2026-07-20 UAL2422 NAS → ORD Jul 20, 20:30 UTCJul 20, 23:20 UTC2h 50m
2026-07-20 UAL2401 ORD → NAS Jul 20, 15:55 UTCJul 20, 18:15 UTC2h 20m
2026-07-20 UAL2653 RSW → EWR Jul 20, 12:20 UTCJul 20, 13:50 UTC1h 30m
2026-07-20 UAL2653 RSW → EWR Jul 20, 12:27 UTCJul 20, 13:35 UTC1h 8m
2026-07-20 UAL8133 - Jul 20, 03:15 UTCJul 20, 04:30 UTC1h 15m
2026-07-19 UAL791 BZN → ORD Jul 19, 23:15 UTCJul 20, 00:55 UTC1h 40m
2026-07-19 UAL791 BZN → ORD Jul 19, 22:57 UTCJul 20, 00:43 UTC1h 46m
2026-07-19 UAL2124 PDX → SFO Jul 19, 20:15 UTCJul 19, 21:40 UTC1h 25m
2026-07-19 UAL2635 LGA → ORD Jul 19, 15:55 UTCJul 19, 18:05 UTC2h 10m
2026-07-19 UAL1657 ORD → LGA Jul 19, 12:25 UTCJul 19, 13:55 UTC1h 30m
2026-07-19 UAL1621 LAX → MCO Jul 19, 02:15 UTCJul 19, 04:35 UTC2h 20m
2026-07-19 UAL1621 LAX → MCO Jul 19, 02:14 UTCJul 19, 04:24 UTC2h 10m
2026-07-18 UAL1811 ORD → BDL Jul 18, 19:10 UTCJul 18, 21:20 UTC2h 10m
2026-07-18 UAL1502 - Jul 18, 14:25 UTCJul 18, 17:15 UTC2h 50m
2026-07-18 UAL1710 ORD → SLC Jul 18, 05:03 UTCJul 18, 07:15 UTC2h 12m
2026-07-18 UAL1710 - Jul 18, 04:40 UTCJul 18, 04:45 UTC5m
2026-07-18 UAL1098 EWR → DEN Jul 18, 00:25 UTCJul 18, 02:19 UTC1h 55m
2026-07-17 UAL1821 PHL → ORD Jul 17, 19:49 UTCJul 17, 21:25 UTC1h 35m
2026-07-17 UAL2635 - Jul 17, 16:10 UTCJul 17, 18:00 UTC1h 50m
2026-07-17 UAL1657 - Jul 17, 13:20 UTCJul 17, 14:55 UTC1h 35m
2026-07-17 UAL1657 ORD → LGA Jul 17, 12:58 UTCJul 17, 14:54 UTC1h 56m

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 N25201 page for operator, model, and routing details .

Mode-S A2615E frequently asked

What is Mode-S code A2615E?
A2615E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N25201.
Where is Mode-S A2615E registered?
Mode-S code A2615E 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 A2615E broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2615E, octal 50460536, decimal 10,641,758.
What flights does A2615E operate?
Mode-S A2615E has broadcast 20 distinct callsigns, including UAL2052, UAL1156, UAL1989, UAL1126, UAL623.