Apparatus

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sensors Mode-S transponder

A16EC2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N19136 · BOEING 757-200 · operated by UNITED AIRLINES INC

Hex
A16EC2
Octal
50267302
Decimal
10,579,650
Country
US
Tail
N19136
Type
B752
Broadcasting now · callsign UAL351 · 10,475 ft
Flights observed
291
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 17:10 UTC

Current position

A16EC2 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A16EC2 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
UAL317 United Airlines 12 2026-07-22
UAL316 - 10 2026-07-22
UAL913 - 8 2026-06-25
UAL398 United Airlines 8 2026-07-26
UAL2641 United Airlines 8 2026-06-11
UAL1710 United Airlines 8 2026-05-20
UAL978 - 7 2026-06-24
UAL310 - 7 2026-07-11
UAL119 United Airlines 7 2026-05-21
UAL118 United Airlines 7 2026-05-21
UAL2428 United Airlines 6 2026-05-20
UAL239 United Airlines 6 2026-06-18
UAL229 United Airlines 6 2026-05-30
UAL887 - 5 2026-06-19
UAL886 United Airlines 5 2026-06-18
UAL311 - 5 2026-07-11
UAL2743 - 5 2026-07-05
UAL2437 United Airlines 5 2026-05-17
UAL2301 - 5 2026-07-06
UAL1558 - 5 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL139 EWR → KEF Jul 26, 11:30 UTCJul 26, 17:05 UTC5h 35m
2026-07-26 UAL398 EWR → TPA Jul 26, 03:40 UTCJul 26, 04:30 UTC50m
2026-07-26 UAL398 EWR → TPA Jul 26, 03:30 UTCJul 26, 08:48 UTC5h 18m
2026-07-25 UAL336 SFO → EWR Jul 25, 18:20 UTCJul 25, 22:50 UTC4h 30m
2026-07-25 UAL2115 MIA → EWR Jul 25, 10:15 UTCJul 25, 16:10 UTC5h 55m
2026-07-24 UAL1700 IAH → EWR Jul 24, 23:30 UTCJul 25, 04:15 UTC4h 45m
2026-07-24 UAL1700 IAH → EWR Jul 24, 23:26 UTCJul 25, 04:06 UTC4h 40m
2026-07-24 UAL2679 DEN → ORD Jul 24, 15:05 UTCJul 24, 20:40 UTC5h 35m
2026-07-23 UAL1597 LAX → SFO Jul 23, 20:20 UTCJul 24, 01:05 UTC4h 45m
2026-07-23 UAL1777 EWR → IAH Jul 23, 13:20 UTCJul 23, 19:00 UTC5h 40m
2026-07-23 UAL327 SJC → DEN Jul 23, 04:30 UTCJul 23, 09:05 UTC4h 35m
2026-07-22 UAL210 DEN → SFO Jul 22, 21:35 UTCJul 23, 02:45 UTC5h 10m
2026-07-22 UAL316 DUB → EWR Jul 22, 12:50 UTCJul 22, 19:45 UTC6h 55m
2026-07-22 UAL317 IAH → PHL Jul 22, 03:40 UTCJul 22, 05:15 UTC1h 35m
2026-07-22 UAL317 IAH → PHL Jul 22, 03:42 UTCJul 22, 09:31 UTC5h 49m
2026-07-21 UAL1597 LAX → SFO Jul 21, 20:45 UTCJul 22, 01:35 UTC4h 50m
2026-07-21 UAL1777 - Jul 21, 13:20 UTCJul 21, 18:55 UTC5h 35m
2026-07-21 UAL2248 BOS → EWR Jul 21, 05:05 UTCJul 21, 10:10 UTC5h 5m
2026-07-20 UAL1340 FLL → EWR Jul 20, 22:20 UTCJul 21, 03:35 UTC5h 14m
2026-07-20 UAL316 DUB → EWR Jul 20, 13:15 UTCJul 20, 20:00 UTC6h 45m
2026-07-20 UAL317 IAH → PHL Jul 20, 04:50 UTCJul 20, 06:20 UTC1h 30m
2026-07-20 UAL317 IAH → PHL Jul 20, 04:47 UTCJul 20, 10:50 UTC6h 3m
2026-07-19 UAL145 OPO → EWR Jul 19, 13:40 UTCJul 19, 21:10 UTC7h 30m
2026-07-19 UAL144 EWR → OPO Jul 19, 04:35 UTCJul 19, 11:38 UTC7h 3m
2026-07-19 UAL144 - Jul 19, 05:15 UTCJul 19, 11:40 UTC6h 25m
2026-07-18 UAL351 - Jul 18, 07:45 UTCJul 18, 15:50 UTC8h 5m
2026-07-17 UAL350 - Jul 17, 22:35 UTCJul 18, 05:25 UTC6h 51m
2026-07-17 UAL1149 - Jul 17, 14:15 UTCJul 17, 19:09 UTC4h 55m
2026-07-17 UAL1558 - Jul 17, 00:50 UTCJul 17, 06:35 UTC5h 45m
2026-07-16 UAL316 DUB → EWR Jul 16, 12:49 UTCJul 16, 19:40 UTC6h 50m
2026-07-16 UAL316 DUB → EWR Jul 16, 12:56 UTCJul 16, 19:44 UTC6h 48m
2026-07-16 UAL317 - Jul 16, 09:00 UTCJul 16, 09:55 UTC55m
2026-07-16 UAL317 - Jul 16, 03:45 UTCJul 16, 05:15 UTC1h 30m
2026-07-15 UAL1597 SFO → EWR Jul 15, 20:00 UTCJul 16, 01:00 UTC5h 0m
2026-07-15 UAL1777 EWR → SFO Jul 15, 12:35 UTCJul 15, 17:45 UTC5h 10m
2026-07-15 UAL698 SFO → EWR Jul 15, 04:45 UTCJul 15, 09:40 UTC4h 55m
2026-07-14 UAL2080 - Jul 14, 20:20 UTCJul 15, 01:45 UTC5h 24m
2026-07-14 UAL1403 - Jul 14, 13:15 UTCJul 14, 18:15 UTC5h 0m
2026-07-13 UAL712 - Jul 13, 02:01 UTCJul 13, 06:40 UTC4h 40m
2026-07-12 UAL139 KEF → EWR Jul 12, 11:10 UTCJul 12, 16:40 UTC5h 30m
2026-07-12 UAL398 IAD → KEF Jul 12, 02:55 UTCJul 12, 08:10 UTC5h 15m
2026-07-11 UAL311 DUB → IAD Jul 11, 08:30 UTCJul 11, 15:50 UTC7h 20m
2026-07-11 UAL310 IAD → DUB Jul 11, 00:44 UTCJul 11, 06:42 UTC5h 58m
2026-07-11 UAL310 - Jul 11, 00:25 UTCJul 11, 02:15 UTC1h 50m
2026-07-10 UAL311 DUB → IAD Jul 10, 08:50 UTCJul 10, 16:20 UTC7h 30m
2026-07-10 UAL310 IAD → DUB Jul 10, 00:24 UTCJul 10, 07:03 UTC6h 39m
2026-07-10 UAL310 IAD → DUB Jul 10, 00:35 UTCJul 10, 07:05 UTC6h 30m
2026-07-09 UAL399 KEF → IAD Jul 9, 11:40 UTCJul 9, 18:00 UTC6h 20m
2026-07-09 UAL138 - Jul 9, 06:20 UTCJul 9, 06:45 UTC25m
2026-07-09 UAL138 - Jul 9, 01:45 UTCJul 9, 03:05 UTC1h 20m

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 N19136 page for operator, model, and routing details .

Mode-S A16EC2 frequently asked

What is Mode-S code A16EC2?
A16EC2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N19136.
Where is Mode-S A16EC2 registered?
Mode-S code A16EC2 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 A16EC2 broadcasting right now?
Yes. Mode-S A16EC2 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A16EC2, octal 50267302, decimal 10,579,650.
What flights does A16EC2 operate?
Mode-S A16EC2 has broadcast 20 distinct callsigns, including UAL317, UAL316, UAL913, UAL398, UAL2641.