Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A2C35A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N27733 · BOEING 737-700 · operated by UNITED AIRLINES INC

Hex
A2C35A
Octal
50541532
Decimal
10,666,842
Country
US
Tail
N27733
Type
B737
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
467
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S A2C35A.

Country allocation

The ICAO 24-bit address A2C35A 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
UAL2116 United Airlines 7 2026-07-18
UAL752 - 6 2026-07-13
UAL241 United Airlines 6 2026-07-23
UAL1852 United Airlines 6 2026-07-25
UAL1564 United Airlines 6 2026-04-18
UAL1381 - 6 2026-07-12
UAL1106 United Airlines 6 2026-07-26
UAL1024 - 6 2026-07-02
UAL632 United Airlines 5 2026-06-07
UAL358 - 5 2026-07-15
UAL2639 - 5 2026-07-19
UAL2405 United Airlines 5 2026-07-22
UAL2236 - 5 2026-07-04
UAL2037 United Airlines 5 2026-07-26
UAL1853 United Airlines 5 2026-07-25
UAL1478 United Airlines 5 2026-07-24
UAL1089 - 5 2026-07-02
UAL657 United Airlines 4 2026-05-16
UAL517 United Airlines 4 2026-04-26
UAL471 - 4 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1785 BOS → IAD Jul 26, 21:55 UTCJul 26, 22:30 UTC35m
2026-07-26 UAL654 AUS → IAD Jul 26, 17:15 UTCJul 26, 19:55 UTC2h 40m
2026-07-26 UAL2037 LGA → ORD Jul 26, 14:00 UTCJul 26, 15:05 UTC1h 5m
2026-07-26 UAL1106 ORD → DFW Jul 26, 01:30 UTCJul 26, 02:35 UTC1h 5m
2026-07-25 UAL1853 IAH → SFO Jul 25, 22:15 UTCJul 25, 23:00 UTC45m
2026-07-25 UAL1853 IAH → SFO Jul 25, 22:00 UTCJul 25, 23:05 UTC1h 5m
2026-07-25 UAL1852 LGA → ORD Jul 25, 19:30 UTCJul 25, 20:30 UTC1h 0m
2026-07-25 UAL1852 LGA → ORD Jul 25, 19:40 UTCJul 25, 20:35 UTC55m
2026-07-25 UAL580 BTV → ORD Jul 25, 13:50 UTCJul 25, 15:45 UTC1h 55m
2026-07-24 UAL349 CZM → ORD Jul 24, 23:25 UTCJul 25, 01:35 UTC2h 10m
2026-07-24 UAL1478 SEA → SFO Jul 24, 14:20 UTCJul 24, 18:10 UTC3h 50m
2026-07-23 UAL241 BNA → EWR Jul 23, 21:55 UTCJul 24, 00:05 UTC2h 10m
2026-07-23 UAL241 BNA → EWR Jul 23, 21:56 UTCJul 24, 01:54 UTC3h 58m
2026-07-23 UAL1860 SFO → LAS Jul 23, 17:45 UTCJul 23, 19:30 UTC1h 45m
2026-07-23 UAL1861 ONT → IAH Jul 23, 14:40 UTCJul 23, 16:30 UTC1h 50m
2026-07-22 UAL2405 SFO → LAS Jul 22, 15:15 UTCJul 22, 19:20 UTC4h 5m
2026-07-22 UAL2464 - Jul 22, 11:25 UTCJul 22, 13:55 UTC2h 30m
2026-07-22 UAL1259 SJC → DEN Jul 22, 00:30 UTCJul 22, 03:05 UTC2h 35m
2026-07-21 UAL497 CVG → DEN Jul 21, 19:20 UTCJul 21, 22:00 UTC2h 40m
2026-07-21 UAL2281 CVG → IAH Jul 21, 15:15 UTCJul 21, 17:40 UTC2h 25m
2026-07-21 UAL2399 MCO → IAH Jul 21, 11:30 UTCJul 21, 13:25 UTC1h 55m
2026-07-20 UAL2846 ORD → ABQ Jul 20, 22:25 UTCJul 21, 00:05 UTC1h 40m
2026-07-20 UAL2405 SFO → LAS Jul 20, 18:02 UTCJul 20, 19:30 UTC1h 28m
2026-07-20 UAL2405 SFO → LAS Jul 20, 15:20 UTCJul 20, 19:35 UTC4h 15m
2026-07-20 UAL1986 - Jul 20, 03:35 UTCJul 20, 06:00 UTC2h 25m
2026-07-19 UAL376 AUS → IAD Jul 19, 22:10 UTCJul 20, 01:20 UTC3h 10m
2026-07-19 UAL2746 IAD → AUS Jul 19, 17:25 UTCJul 19, 20:10 UTC2h 45m
2026-07-19 UAL2639 DFW → IAD Jul 19, 12:35 UTCJul 19, 15:05 UTC2h 30m
2026-07-18 UAL2116 IAH → SFO Jul 18, 23:55 UTCJul 19, 02:30 UTC2h 35m
2026-07-18 UAL2264 SLC → IAD Jul 18, 15:45 UTCJul 18, 20:35 UTC4h 50m
2026-07-17 UAL2410 MSY → SFO Jul 17, 22:49 UTCJul 18, 02:50 UTC4h 1m
2026-07-17 UAL780 - Jul 17, 19:25 UTCJul 17, 20:20 UTC55m
2026-07-17 UAL1709 IAD → CLE Jul 17, 17:09 UTCJul 17, 18:00 UTC50m
2026-07-17 UAL2639 DFW → IAD Jul 17, 12:40 UTCJul 17, 15:15 UTC2h 35m
2026-07-16 UAL2116 IAH → SFO Jul 16, 22:30 UTCJul 17, 01:09 UTC2h 40m
2026-07-16 UAL780 CLE → IAD Jul 16, 19:40 UTCJul 16, 20:29 UTC50m
2026-07-16 UAL1709 - Jul 16, 17:25 UTCJul 16, 18:19 UTC55m
2026-07-16 UAL204 - Jul 16, 12:09 UTCJul 16, 15:35 UTC3h 25m
2026-07-15 UAL1822 IAD → ABQ Jul 15, 22:05 UTCJul 16, 01:25 UTC3h 20m
2026-07-15 UAL358 DFW → IAD Jul 15, 18:10 UTCJul 15, 20:50 UTC2h 40m
2026-07-15 UAL358 DFW → IAD Jul 15, 17:40 UTCJul 15, 20:44 UTC3h 4m
2026-07-15 UAL528 ORD → DFW Jul 15, 14:05 UTCJul 15, 15:55 UTC1h 50m
2026-07-15 UAL2684 - Jul 15, 10:40 UTCJul 15, 12:00 UTC1h 20m
2026-07-15 UAL1557 - Jul 15, 00:05 UTCJul 15, 01:30 UTC1h 25m
2026-07-14 UAL2357 - Jul 14, 14:25 UTCJul 14, 21:15 UTC6h 50m
2026-07-14 UAL1499 - Jul 14, 11:40 UTCJul 14, 12:25 UTC45m
2026-07-14 UAL1499 CID → ORD Jul 14, 11:50 UTCJul 14, 12:16 UTC26m
2026-07-14 UAL1393 ORD → CID Jul 14, 01:05 UTCJul 14, 01:35 UTC30m
2026-07-13 UAL654K - Jul 13, 22:55 UTCJul 13, 23:05 UTC10m
2026-07-13 UAL654K DCA → ORD Jul 13, 21:25 UTCJul 13, 23:05 UTC1h 40m

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 N27733 page for operator, model, and routing details .

Mode-S A2C35A frequently asked

What is Mode-S code A2C35A?
A2C35A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N27733.
Where is Mode-S A2C35A registered?
Mode-S code A2C35A 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 A2C35A broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2C35A, octal 50541532, decimal 10,666,842.
What flights does A2C35A operate?
Mode-S A2C35A has broadcast 20 distinct callsigns, including UAL2116, UAL752, UAL241, UAL1852, UAL1564.