Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A16EE0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N19141 · BOEING 757-200 · operated by UNITED AIRLINES INC

Hex
A16EE0
Octal
50267340
Decimal
10,579,680
Country
US
Tail
N19141
Type
B752
No current signal · last broadcast 20h ago
Flights observed
132
Distinct callsigns
20
Country
US
Last broadcast
20h ago

Last known position

Most recent position reported by Mode-S A16EE0.

Country allocation

The ICAO 24-bit address A16EE0 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
UAL912 - 6 2026-07-13
UAL228 - 6 2026-07-09
UAL913 - 5 2026-06-24
UAL419 - 5 2026-06-21
UAL229 - 5 2026-07-09
UAL119 United Airlines 5 2026-06-25
UAL118 United Airlines 5 2026-06-25
UAL398 - 4 2026-07-11
UAL2080 United Airlines 4 2026-06-08
UAL139 - 4 2026-07-11
UAL1343 - 4 2026-07-03
UAL887 - 3 2026-07-02
UAL351 - 3 2026-06-22
UAL316 United Airlines 3 2026-05-27
UAL1970 United Airlines 3 2026-06-10
UAL1558 United Airlines 3 2026-06-12
UAL886 United Airlines 2 2026-07-01
UAL698 United Airlines 2 2026-06-09
UAL661 - 2 2026-07-12
UAL399 - 2 2026-06-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 UAL912 ORD → ORD Jul 13, 03:40 UTCJul 13, 06:35 UTC2h 55m
2026-07-12 UAL661 - Jul 12, 20:55 UTCJul 12, 22:45 UTC1h 50m
2026-07-12 UAL2743 - Jul 12, 14:30 UTCJul 12, 19:20 UTC4h 50m
2026-07-11 UAL2191 - Jul 11, 19:10 UTCJul 12, 00:10 UTC5h 0m
2026-07-11 UAL139 KEF → EWR Jul 11, 11:25 UTCJul 11, 17:05 UTC5h 40m
2026-07-11 UAL398 - Jul 11, 05:05 UTCJul 11, 08:35 UTC3h 30m
2026-07-11 UAL398 - Jul 11, 03:25 UTCJul 11, 05:01 UTC1h 35m
2026-07-09 UAL229 DUB → IAD Jul 9, 11:35 UTCJul 9, 19:20 UTC7h 45m
2026-07-09 UAL229 DUB → IAD Jul 9, 11:41 UTCJul 9, 19:14 UTC7h 33m
2026-07-09 UAL228 IAD → DUB Jul 9, 02:55 UTCJul 9, 09:30 UTC6h 35m
2026-07-08 UAL229 DUB → IAD Jul 8, 11:50 UTCJul 8, 18:55 UTC7h 5m
2026-07-08 UAL228 - Jul 8, 03:15 UTCJul 8, 05:20 UTC2h 5m
2026-07-08 UAL228 IAD → DUB Jul 8, 02:50 UTCJul 8, 09:52 UTC7h 2m
2026-07-07 UAL979 EDI → IAD Jul 7, 13:15 UTCJul 7, 20:30 UTC7h 15m
2026-07-07 UAL978 IAD → EDI Jul 7, 04:35 UTCJul 7, 11:00 UTC6h 25m
2026-07-06 UAL336J - Jul 6, 18:00 UTCJul 6, 22:45 UTC4h 45m
2026-07-03 UAL1343 - Jul 3, 16:25 UTCJul 3, 21:55 UTC5h 30m
2026-07-02 UAL2248 SFO → EWR Jul 2, 23:00 UTCJul 3, 03:50 UTC4h 50m
2026-07-02 UAL648 - Jul 2, 15:40 UTCJul 2, 21:15 UTC5h 35m
2026-07-02 UAL887 - Jul 2, 04:55 UTCJul 2, 12:00 UTC7h 5m
2026-07-01 UAL886 EWR → LIM Jul 1, 19:45 UTCJul 2, 02:35 UTC6h 50m
2026-07-01 UAL139 KEF → EWR Jul 1, 11:20 UTCJul 1, 16:40 UTC5h 20m
2026-07-01 UAL398 - Jul 1, 08:10 UTCJul 1, 08:35 UTC25m
2026-07-01 UAL398 - Jul 1, 03:10 UTCJul 1, 04:45 UTC1h 35m
2026-06-30 UAL311 DUB → IAD Jun 30, 08:35 UTCJun 30, 15:35 UTC7h 0m
2026-06-30 UAL310 - Jun 30, 00:49 UTCJun 30, 03:00 UTC2h 11m
2026-06-30 UAL310 IAD → DUB Jun 30, 00:54 UTCJun 30, 06:54 UTC6h 0m
2026-06-29 UAL399 KEF → IAD Jun 29, 11:35 UTCJun 29, 17:19 UTC5h 45m
2026-06-29 UAL138 EWR → KEF Jun 29, 02:20 UTCJun 29, 07:25 UTC5h 5m
2026-06-28 UAL1283 EWR → ATL Jun 28, 19:04 UTCJun 28, 22:15 UTC3h 10m
2026-06-27 UAL2307 - Jun 27, 18:39 UTCJun 28, 12:05 UTC17h 25m
2026-06-26 UAL663 - Jun 26, 20:10 UTCJun 27, 00:00 UTC3h 50m
2026-06-26 UAL139 KEF → EWR Jun 26, 11:29 UTCJun 26, 16:56 UTC5h 27m
2026-06-26 UAL139 KEF → EWR Jun 26, 11:14 UTCJun 26, 16:44 UTC5h 30m
2026-06-26 UAL138 EWR → KEF Jun 26, 01:45 UTCJun 26, 06:39 UTC4h 55m
2026-06-25 UAL1968 ORD → EWR Jun 25, 22:29 UTCJun 25, 23:59 UTC1h 30m
2026-06-25 UAL119 ORD → EDI Jun 25, 10:35 UTCJun 25, 18:29 UTC7h 55m
2026-06-25 UAL118 ORD → EDI Jun 25, 01:24 UTCJun 25, 08:04 UTC6h 40m
2026-06-25 UAL118 ORD → EDI Jun 25, 00:22 UTCJun 25, 07:59 UTC7h 37m
2026-06-24 UAL913 KEF → ORD Jun 24, 12:19 UTCJun 24, 18:03 UTC5h 44m
2026-06-24 UAL913 KEF → ORD Jun 24, 12:14 UTCJun 24, 18:25 UTC6h 10m
2026-06-24 UAL912 ORD → KEF Jun 24, 03:35 UTCJun 24, 09:09 UTC5h 35m
2026-06-23 UAL119 ORD → EDI Jun 23, 10:39 UTCJun 23, 18:39 UTC8h 0m
2026-06-23 UAL118 ORD → EDI Jun 23, 00:37 UTCJun 23, 07:11 UTC6h 34m
2026-06-23 UAL118 ORD → EDI Jun 23, 00:19 UTCJun 23, 02:09 UTC1h 50m
2026-06-22 UAL2788 - Jun 22, 19:09 UTCJun 22, 21:40 UTC2h 30m
2026-06-22 UAL351 - Jun 22, 07:49 UTCJun 22, 08:00 UTC10m
2026-06-22 UAL351 AGP → EWR Jun 22, 07:52 UTCJun 22, 16:07 UTC8h 15m
2026-06-22 UAL351 AGP → EWR Jun 22, 07:52 UTCJun 22, 16:06 UTC8h 14m
2026-06-21 UAL350 - Jun 21, 22:49 UTCJun 22, 05:44 UTC6h 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 N19141 page for operator, model, and routing details .

Mode-S A16EE0 frequently asked

What is Mode-S code A16EE0?
A16EE0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N19141.
Where is Mode-S A16EE0 registered?
Mode-S code A16EE0 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 A16EE0 broadcasting right now?
No active broadcast right now. Last signal was 20h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A16EE0, octal 50267340, decimal 10,579,680.
What flights does A16EE0 operate?
Mode-S A16EE0 has broadcast 20 distinct callsigns, including UAL912, UAL228, UAL913, UAL419, UAL229.