Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A2CB13

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N27958 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC

Hex
A2CB13
Octal
50545423
Decimal
10,668,819
Country
US
Tail
N27958
Type
B789
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
203
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A2CB13.

Country allocation

The ICAO 24-bit address A2CB13 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
UAL60 - 15 2026-07-07
UAL61 - 14 2026-07-08
UAL28 United Airlines 9 2026-07-21
UAL892 United Airlines 8 2026-06-12
UAL2 United Airlines 8 2026-04-17
UAL1757 United Airlines 8 2026-07-25
UAL1 United Airlines 8 2026-05-14
UAL893 - 6 2026-06-11
UAL29 United Airlines 6 2026-07-19
UAL123 United Airlines 6 2026-07-22
UAL863 United Airlines 5 2026-07-26
UAL806 United Airlines 5 2026-06-03
UAL713 - 5 2026-07-08
UAL3964 United Airlines 5 2026-05-17
UAL1849 United Airlines 5 2026-05-29
UAL870 - 4 2026-07-04
UAL805 United Airlines 4 2026-06-02
UAL2480 United Airlines 4 2026-06-18
UAL198 - 4 2026-06-25
UAL1227 United Airlines 4 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL863 SFO → SYD Jul 26, 06:31 UTCJul 26, 21:25 UTC14h 54m
2026-07-26 UAL863 SFO → SYD Jul 26, 06:35 UTCJul 26, 21:35 UTC15h 0m
2026-07-25 UAL1757 PIT → DEN Jul 25, 22:33 UTCJul 26, 03:36 UTC5h 3m
2026-07-25 UAL1757 PIT → DEN Jul 25, 22:40 UTCJul 26, 03:40 UTC5h 0m
2026-07-24 UAL2023 BOS → ORD Jul 24, 18:20 UTCJul 25, 09:25 UTC15h 5m
2026-07-23 UAL1011 MCI → SFO Jul 23, 22:55 UTCJul 24, 13:15 UTC14h 20m
2026-07-23 UAL3901 RDU → ORD Jul 23, 06:25 UTCJul 23, 07:10 UTC45m
2026-07-22 UAL123 ANC → ORD Jul 22, 19:35 UTCJul 22, 20:45 UTC1h 10m
2026-07-22 UAL123 ANC → ORD Jul 22, 19:23 UTCJul 23, 02:19 UTC6h 56m
2026-07-22 UAL123 ANC → ORD Jul 22, 19:23 UTCJul 23, 02:24 UTC7h 1m
2026-07-22 UAL948 SFO → LHR Jul 22, 00:35 UTCJul 22, 11:30 UTC10h 55m
2026-07-21 UAL28 SIN → SFO Jul 21, 04:50 UTCJul 21, 05:05 UTC15m
2026-07-20 UAL28 SIN → SFO Jul 20, 13:16 UTCJul 21, 04:31 UTC15h 15m
2026-07-20 UAL28 SIN → SFO Jul 20, 13:16 UTCJul 21, 04:58 UTC15h 42m
2026-07-20 UAL28 SIN → SFO Jul 20, 07:25 UTCJul 20, 19:40 UTC12h 15m
2026-07-19 UAL29 SFO → SIN Jul 19, 19:05 UTCJul 20, 18:45 UTC23h 40m
2026-07-18 UAL1227 PHX → IAD Jul 18, 21:10 UTCJul 19, 02:25 UTC5h 15m
2026-07-17 UAL3916 - Jul 17, 21:15 UTCJul 17, 23:10 UTC1h 55m
2026-07-17 UAL908 - Jul 17, 10:30 UTCJul 17, 18:25 UTC7h 55m
2026-07-17 UAL909 - Jul 17, 00:10 UTCJul 17, 07:30 UTC7h 20m
2026-07-17 UAL909 ORD → AMS Jul 17, 00:12 UTCJul 17, 07:21 UTC7h 9m
2026-07-15 UAL415 MXP → ORD Jul 15, 14:00 UTCJul 15, 22:45 UTC8h 45m
2026-07-15 UAL416 - Jul 15, 03:45 UTCJul 15, 11:55 UTC8h 10m
2026-07-14 UAL3937 IAD → ORD Jul 14, 19:00 UTCJul 14, 20:20 UTC1h 20m
2026-07-14 UAL991 - Jul 14, 09:35 UTCJul 14, 17:30 UTC7h 55m
2026-07-13 UAL992 IAD → BCN Jul 13, 22:50 UTCJul 14, 06:05 UTC7h 15m
2026-07-13 UAL3920 EWR → IAD Jul 13, 19:35 UTCJul 13, 20:15 UTC40m
2026-07-10 UAL187 - Jul 10, 21:10 UTCJul 11, 11:55 UTC14h 45m
2026-07-09 UAL188 - Jul 9, 02:05 UTCJul 9, 16:30 UTC14h 25m
2026-07-09 UAL188 EWR → JNB Jul 9, 02:04 UTCJul 9, 16:25 UTC14h 21m
2026-07-08 UAL713 SFO → EWR Jul 8, 18:00 UTCJul 8, 22:45 UTC4h 45m
2026-07-08 UAL61 MEL → SFO Jul 8, 01:10 UTCJul 8, 14:10 UTC13h 0m
2026-07-07 UAL60 SFO → MEL Jul 7, 07:40 UTCJul 7, 22:20 UTC14h 40m
2026-07-07 UAL60 SFO → MEL Jul 7, 07:10 UTCJul 7, 22:18 UTC15h 8m
2026-07-06 UAL1227 EWR → SFO Jul 6, 17:50 UTCJul 6, 23:20 UTC5h 30m
2026-07-06 UAL123 - Jul 6, 06:50 UTCJul 6, 13:55 UTC7h 5m
2026-07-06 UAL123 LHR → EWR Jul 6, 07:02 UTCJul 6, 13:52 UTC6h 50m
2026-07-05 UAL122 EWR → LHR Jul 5, 14:10 UTCJul 5, 20:05 UTC5h 55m
2026-07-04 UAL713 SFO → EWR Jul 4, 17:54 UTCJul 4, 23:12 UTC5h 18m
2026-07-04 UAL713 SFO → EWR Jul 4, 17:55 UTCJul 4, 22:50 UTC4h 55m
2026-07-04 UAL870 SYD → SFO Jul 4, 00:55 UTCJul 4, 13:50 UTC12h 55m
2026-07-04 UAL870 - Jul 4, 00:50 UTCJul 4, 13:45 UTC12h 55m
2026-07-03 UAL839 - Jul 3, 06:55 UTCJul 3, 21:50 UTC14h 55m
2026-07-02 UAL935 - Jul 2, 12:30 UTCJul 2, 23:00 UTC10h 30m
2026-07-01 UAL923 - Jul 1, 23:25 UTCJul 2, 08:45 UTC9h 20m
2026-07-01 UAL2692 - Jul 1, 14:00 UTCJul 1, 18:50 UTC4h 50m
2026-06-30 UAL83 DEL → EWR Jun 30, 18:45 UTCJul 1, 02:45 UTC8h 0m
2026-06-30 UAL83 DEL → EWR Jun 30, 18:32 UTCJul 1, 10:09 UTC15h 37m
2026-06-30 UAL82 - Jun 30, 02:00 UTCJun 30, 15:30 UTC13h 30m
2026-06-28 UAL187 - Jun 28, 20:04 UTCJun 29, 11:20 UTC15h 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 N27958 page for operator, model, and routing details .

Mode-S A2CB13 frequently asked

What is Mode-S code A2CB13?
A2CB13 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N27958.
Where is Mode-S A2CB13 registered?
Mode-S code A2CB13 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 A2CB13 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2CB13, octal 50545423, decimal 10,668,819.
What flights does A2CB13 operate?
Mode-S A2CB13 has broadcast 20 distinct callsigns, including UAL60, UAL61, UAL28, UAL892, UAL2.