Apparatus

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sensors Mode-S transponder

A44213

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N37353 · operated by UNITED AIRLINES INC

Hex
A44213
Octal
51041023
Decimal
10,764,819
Country
US
Tail
N37353
Type
B38M
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
443
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A44213.

Country allocation

The ICAO 24-bit address A44213 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
UAL1675 - 8 2026-07-16
UAL783 United Airlines 7 2026-05-27
UAL1676 - 7 2026-07-16
UAL508 United Airlines 5 2026-04-15
UAL209 - 5 2026-06-18
UAL1459 United Airlines 5 2026-04-22
UAL1099 United Airlines 5 2026-07-26
UAL643 - 4 2026-06-15
UAL2353 United Airlines 4 2026-04-21
UAL2313 United Airlines 4 2026-07-02
UAL2312 United Airlines 4 2026-05-22
UAL2162 - 4 2026-07-14
UAL1901 - 4 2026-07-04
UAL1678 United Airlines 4 2026-05-25
UAL1663 - 4 2026-07-17
UAL1589 United Airlines 4 2026-07-20
UAL1454 - 4 2026-07-13
UAL1383 United Airlines 4 2026-04-19
UAL742 United Airlines 3 2026-04-19
UAL504 United Airlines 3 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1099 SJO → IAH Jul 26, 19:35 UTCJul 26, 22:45 UTC3h 10m
2026-07-26 UAL1096 IAH → SJO Jul 26, 15:05 UTCJul 26, 18:15 UTC3h 10m
2026-07-26 UAL2606 ORD → LGA Jul 26, 10:45 UTCJul 26, 12:50 UTC2h 5m
2026-07-26 UAL1829 EWR → SFO Jul 26, 00:30 UTCJul 26, 02:35 UTC2h 5m
2026-07-25 UAL2690 LAS → IAH Jul 25, 18:39 UTCJul 25, 21:40 UTC3h 1m
2026-07-25 UAL2690 LAS → IAH Jul 25, 18:40 UTCJul 25, 21:45 UTC3h 5m
2026-07-25 UAL1886 IAH → SFO Jul 25, 12:35 UTCJul 25, 15:30 UTC2h 55m
2026-07-25 UAL1097 BUR → SFO Jul 25, 06:43 UTCJul 25, 09:43 UTC3h 0m
2026-07-25 UAL1097 BUR → SFO Jul 25, 06:40 UTCJul 25, 09:45 UTC3h 5m
2026-07-25 UAL1055 EWR → ATL Jul 25, 01:15 UTCJul 25, 04:30 UTC3h 15m
2026-07-24 UAL1099 SJO → IAH Jul 24, 19:40 UTCJul 24, 22:55 UTC3h 15m
2026-07-24 UAL1096 IAH → SJO Jul 24, 14:50 UTCJul 24, 18:05 UTC3h 15m
2026-07-24 UAL1552 FLL → EWR Jul 24, 06:40 UTCJul 24, 12:55 UTC6h 15m
2026-07-23 UAL841 NRT → GUM Jul 23, 22:13 UTCJul 24, 04:23 UTC6h 10m
2026-07-23 UAL841 NRT → GUM Jul 23, 22:20 UTCJul 24, 04:35 UTC6h 15m
2026-07-23 UAL1382 PHX → EWR Jul 23, 18:25 UTCJul 23, 19:10 UTC45m
2026-07-23 UAL1355 IAD → EWR Jul 23, 16:15 UTCJul 23, 17:00 UTC45m
2026-07-23 UAL834 SFO → PIT Jul 23, 08:17 UTCJul 23, 13:33 UTC5h 16m
2026-07-23 UAL834 SFO → PIT Jul 23, 08:10 UTCJul 23, 13:50 UTC5h 40m
2026-07-23 UAL1594 IAD → LAX Jul 23, 02:25 UTCJul 23, 06:45 UTC4h 20m
2026-07-23 UAL1594 IAD → LAX Jul 23, 02:29 UTCJul 23, 06:40 UTC4h 11m
2026-07-22 UAL2866 LAX → CLE Jul 22, 23:15 UTCJul 23, 01:05 UTC1h 50m
2026-07-22 UAL2744 MCO → EWR Jul 22, 19:20 UTCJul 22, 20:45 UTC1h 25m
2026-07-22 UAL369 BOS → EWR Jul 22, 12:30 UTCJul 22, 17:40 UTC5h 10m
2026-07-22 UAL1627 LAX → EWR Jul 22, 03:05 UTCJul 22, 05:25 UTC2h 20m
2026-07-22 UAL1627 LAX → EWR Jul 22, 03:11 UTCJul 22, 05:41 UTC2h 30m
2026-07-21 UAL438 BOI → SFO Jul 21, 09:40 UTCJul 21, 11:45 UTC2h 5m
2026-07-21 UAL438 BOI → SFO Jul 21, 09:19 UTCJul 21, 15:14 UTC5h 55m
2026-07-21 UAL438 BOI → SFO Jul 21, 09:19 UTCJul 21, 15:14 UTC5h 55m
2026-07-21 UAL437 DEN → SJC Jul 21, 01:55 UTCJul 21, 07:15 UTC5h 20m
2026-07-21 UAL437 DEN → SJC Jul 21, 02:06 UTCJul 21, 07:34 UTC5h 28m
2026-07-20 UAL1589 IAH → LGA Jul 20, 17:30 UTCJul 20, 20:40 UTC3h 10m
2026-07-20 UAL2448 PHX → SFO Jul 20, 12:50 UTCJul 20, 16:05 UTC3h 15m
2026-07-20 UAL206 BOG → IAH Jul 20, 05:58 UTCJul 20, 10:10 UTC4h 12m
2026-07-20 UAL206 BOG → IAH Jul 20, 05:58 UTCJul 20, 10:06 UTC4h 8m
2026-07-20 UAL206 - Jul 20, 05:40 UTCJul 20, 06:10 UTC30m
2026-07-19 UAL268 EWR → BOG Jul 19, 22:30 UTCJul 20, 03:45 UTC5h 15m
2026-07-19 UAL1152 PHX → EWR Jul 19, 15:15 UTCJul 19, 20:10 UTC4h 55m
2026-07-19 UAL1814 EWR → PHX Jul 19, 05:40 UTCJul 19, 09:55 UTC4h 15m
2026-07-18 UAL1880 SXM → EWR Jul 18, 21:35 UTCJul 18, 22:40 UTC1h 5m
2026-07-18 UAL1880 SXM → EWR Jul 18, 16:35 UTCJul 18, 21:30 UTC4h 55m
2026-07-18 UAL346 - Jul 18, 13:30 UTCJul 18, 14:20 UTC50m
2026-07-18 UAL1926 - Jul 18, 09:35 UTCJul 18, 10:45 UTC1h 10m
2026-07-18 UAL2064 IAD → PWM Jul 18, 02:25 UTCJul 18, 03:41 UTC1h 16m
2026-07-18 UAL2064 - Jul 18, 02:35 UTCJul 18, 03:40 UTC1h 6m
2026-07-17 UAL1445 - Jul 17, 21:10 UTCJul 18, 00:39 UTC3h 30m
2026-07-17 UAL1908 - Jul 17, 15:25 UTCJul 17, 19:35 UTC4h 10m
2026-07-17 UAL584 PHX → EWR Jul 17, 10:35 UTCJul 17, 13:29 UTC2h 55m
2026-07-17 UAL1663 - Jul 17, 00:40 UTCJul 17, 03:25 UTC2h 45m
2026-07-16 UAL1676 - Jul 16, 15:10 UTCJul 16, 19:25 UTC4h 15m

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 N37353 page for operator, model, and routing details .

Mode-S A44213 frequently asked

What is Mode-S code A44213?
A44213 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N37353.
Where is Mode-S A44213 registered?
Mode-S code A44213 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 A44213 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A44213, octal 51041023, decimal 10,764,819.
What flights does A44213 operate?
Mode-S A44213 has broadcast 20 distinct callsigns, including UAL1675, UAL783, UAL1676, UAL508, UAL209.