Apparatus

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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 Jul 26, 20:05 UTC
Flights observed
158
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:05 UTC

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
UAL979 United Airlines 5 2026-07-26
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
UAL978 United Airlines 4 2026-07-26
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
UAL712 - 3 2026-07-18
UAL351 - 3 2026-06-22
UAL316 United Airlines 3 2026-05-27
UAL311 United Airlines 3 2026-07-25
UAL310 United Airlines 3 2026-07-24
UAL2743 - 3 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL979 EDI → IAD Jul 26, 12:25 UTCJul 26, 20:00 UTC7h 35m
2026-07-26 UAL978 IAD → EDI Jul 26, 02:45 UTCJul 26, 09:10 UTC6h 26m
2026-07-25 UAL311 BOS → LAX Jul 25, 08:15 UTCJul 25, 15:30 UTC7h 15m
2026-07-25 UAL311 BOS → LAX Jul 25, 07:57 UTCJul 25, 15:26 UTC7h 29m
2026-07-24 UAL310 EWR → SFO Jul 24, 23:35 UTCJul 25, 06:10 UTC6h 35m
2026-07-24 UAL979 EDI → IAD Jul 24, 11:35 UTCJul 24, 19:05 UTC7h 30m
2026-07-24 UAL978 IAD → EDI Jul 24, 02:55 UTCJul 24, 09:00 UTC6h 5m
2026-07-23 UAL979 EDI → IAD Jul 23, 12:30 UTCJul 23, 20:00 UTC7h 30m
2026-07-23 UAL979 EDI → IAD Jul 23, 12:25 UTCJul 23, 19:59 UTC7h 34m
2026-07-23 UAL978 IAD → EDI Jul 23, 04:35 UTCJul 23, 10:40 UTC6h 5m
2026-07-21 UAL8180 YUL → LGA Jul 21, 22:35 UTCJul 22, 04:35 UTC6h 0m
2026-07-21 UAL8180 YUL → LGA Jul 21, 20:47 UTCJul 22, 04:20 UTC7h 33m
2026-07-21 UAL271 - Jul 21, 11:45 UTCJul 21, 18:30 UTC6h 45m
2026-07-21 UAL271 SNN → EWR Jul 21, 11:42 UTCJul 21, 18:33 UTC6h 51m
2026-07-21 UAL270 EUG → SFO Jul 21, 03:20 UTCJul 21, 08:55 UTC5h 35m
2026-07-20 UAL2227 - Jul 20, 19:45 UTCJul 21, 00:35 UTC4h 49m
2026-07-19 UAL2191 - Jul 19, 19:15 UTCJul 20, 00:05 UTC4h 50m
2026-07-19 UAL3026 IAD → EWR Jul 19, 11:40 UTCJul 19, 12:20 UTC40m
2026-07-18 UAL2743 LAX → IAD Jul 18, 15:00 UTCJul 18, 20:35 UTC5h 35m
2026-07-18 UAL712 EWR → LAX Jul 18, 02:23 UTCJul 18, 07:21 UTC4h 58m
2026-07-18 UAL712 - Jul 18, 02:19 UTCJul 18, 07:35 UTC5h 16m
2026-07-17 UAL2171 GRR → DEN Jul 17, 22:29 UTCJul 18, 00:39 UTC2h 10m
2026-07-17 UAL2053 EWR → ORD Jul 17, 17:44 UTCJul 17, 20:00 UTC2h 15m
2026-07-17 UAL2301 PHL → ORD Jul 17, 14:50 UTCJul 17, 16:29 UTC1h 40m
2026-07-17 UAL2301 PHL → ORD Jul 17, 14:10 UTCJul 17, 16:25 UTC2h 15m
2026-07-15 UAL4197 - Jul 15, 21:40 UTCJul 15, 22:55 UTC1h 15m
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

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 Jul 26, 20:05 UTC.
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, UAL979, UAL913, UAL419.