Apparatus

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sensors Mode-S transponder

A913D6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N684UA · BOEING 767-300 · operated by UNITED AIRLINES INC

Hex
A913D6
Octal
52211726
Decimal
11,080,662
Country
US
Tail
N684UA
Type
B763
No current signal · last broadcast Jul 26, 16:00 UTC
Flights observed
189
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 16:00 UTC

Last known position

Most recent position reported by Mode-S A913D6.

Country allocation

The ICAO 24-bit address A913D6 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
UAL957 United Airlines 13 2026-07-26
UAL956 United Airlines 12 2026-07-25
UAL920 - 12 2026-07-17
UAL959 United Airlines 10 2026-07-24
UAL929 United Airlines 10 2026-07-24
UAL17 - 9 2026-07-18
UAL963 - 6 2026-06-14
UAL962 United Airlines 6 2026-06-13
UAL940 United Airlines 6 2026-06-07
UAL921 United Airlines 6 2026-07-21
UAL16 United Airlines 6 2026-05-24
UAL147 United Airlines 6 2026-07-25
UAL965 - 5 2026-06-23
UAL964 - 5 2026-06-22
UAL967 United Airlines 4 2026-07-22
UAL928 United Airlines 4 2026-06-07
UAL905 - 4 2026-04-14
UAL381 United Airlines 4 2026-05-24
UAL15 United Airlines 4 2026-06-06
UAL380 United Airlines 3 2026-05-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL957 GVA → EWR Jul 26, 07:35 UTCJul 26, 15:55 UTC8h 20m
2026-07-25 UAL956 EWR → GVA Jul 25, 22:10 UTCJul 26, 05:15 UTC7h 5m
2026-07-25 UAL147 LHR → EWR Jul 25, 11:30 UTCJul 25, 18:55 UTC7h 25m
2026-07-24 UAL929 ORD → LHR Jul 24, 22:15 UTCJul 25, 05:30 UTC7h 15m
2026-07-24 UAL959 LHR → ORD Jul 24, 10:25 UTCJul 24, 18:45 UTC8h 20m
2026-07-23 UAL929 ORD → LHR Jul 23, 22:20 UTCJul 24, 05:30 UTC7h 10m
2026-07-23 UAL929 ORD → LHR Jul 23, 22:03 UTCJul 24, 05:28 UTC7h 25m
2026-07-23 UAL3045 EWR → SFO Jul 23, 05:00 UTCJul 23, 06:50 UTC1h 50m
2026-07-22 UAL967 NAP → EWR Jul 22, 14:25 UTCJul 22, 23:35 UTC9h 10m
2026-07-22 UAL967 NAP → EWR Jul 22, 14:24 UTCJul 22, 23:32 UTC9h 8m
2026-07-22 UAL966 EWR → NAP Jul 22, 04:10 UTCJul 22, 12:15 UTC8h 5m
2026-07-21 UAL921 LHR → EWR Jul 21, 17:25 UTCJul 22, 00:55 UTC7h 30m
2026-07-20 UAL929 ORD → LHR Jul 20, 22:15 UTCJul 21, 05:30 UTC7h 14m
2026-07-20 UAL958 ORD → LHR Jul 20, 07:20 UTCJul 20, 15:25 UTC8h 5m
2026-07-19 UAL934 EWR → LHR Jul 19, 12:45 UTCJul 19, 19:35 UTC6h 50m
2026-07-18 UAL17 LHR → EWR Jul 18, 09:50 UTCJul 18, 17:59 UTC8h 9m
2026-07-18 UAL17 LHR → EWR Jul 18, 10:05 UTCJul 18, 18:00 UTC7h 55m
2026-07-17 UAL929 ORD → LHR Jul 17, 22:13 UTCJul 18, 05:30 UTC7h 17m
2026-07-17 UAL929 ORD → LHR Jul 17, 22:15 UTCJul 18, 05:35 UTC7h 21m
2026-07-17 UAL959 LHR → ORD Jul 17, 10:30 UTCJul 17, 18:36 UTC8h 6m
2026-07-17 UAL959 LHR → ORD Jul 17, 10:30 UTCJul 17, 11:45 UTC1h 15m
2026-07-17 UAL920 - Jul 17, 06:10 UTCJul 17, 07:50 UTC1h 40m
2026-07-17 UAL920 - Jul 17, 00:10 UTCJul 17, 02:10 UTC2h 0m
2026-07-16 UAL920 ORD → LHR Jul 16, 23:57 UTCJul 17, 07:39 UTC7h 42m
2026-07-15 UAL3921 SFO → ORD Jul 15, 20:45 UTCJul 16, 00:25 UTC3h 40m
2026-06-25 UAL3921 EWR → SFO Jun 25, 19:15 UTCJun 26, 01:15 UTC6h 0m
2026-06-23 UAL965 - Jun 23, 08:45 UTCJun 23, 17:54 UTC9h 10m
2026-06-23 UAL965 NAP → EWR Jun 23, 08:09 UTCJun 23, 17:53 UTC9h 44m
2026-06-22 UAL964 - Jun 22, 20:55 UTCJun 23, 05:00 UTC8h 5m
2026-06-22 UAL964 EWR → NAP Jun 22, 20:58 UTCJun 23, 05:06 UTC8h 8m
2026-06-21 UAL17 - Jun 21, 09:44 UTCJun 21, 11:05 UTC1h 20m
2026-06-21 UAL17 LHR → EWR Jun 21, 09:50 UTCJun 21, 16:59 UTC7h 9m
2026-06-21 UAL17 LHR → EWR Jun 21, 09:50 UTCJun 21, 17:00 UTC7h 10m
2026-06-20 UAL929 - Jun 20, 22:05 UTCJun 21, 05:49 UTC7h 45m
2026-06-20 UAL929 ORD → LHR Jun 20, 22:03 UTCJun 21, 05:40 UTC7h 37m
2026-06-20 UAL959 - Jun 20, 10:25 UTCJun 20, 12:50 UTC2h 25m
2026-06-20 UAL959 LHR → ORD Jun 20, 10:30 UTCJun 20, 18:31 UTC8h 1m
2026-06-20 UAL904 - Jun 20, 00:39 UTCJun 20, 07:04 UTC6h 25m
2026-06-19 UAL273 NCE → EWR Jun 19, 10:44 UTCJun 19, 19:14 UTC8h 30m
2026-06-19 UAL272 EWR → NCE Jun 19, 00:40 UTCJun 19, 08:14 UTC7h 35m
2026-06-18 UAL31 MUC → EWR Jun 18, 07:55 UTCJun 18, 16:25 UTC8h 30m
2026-06-17 UAL30 EWR → MUC Jun 17, 21:20 UTCJun 18, 04:45 UTC7h 25m
2026-06-17 UAL965 - Jun 17, 08:05 UTCJun 17, 17:15 UTC9h 10m
2026-06-16 UAL964 - Jun 16, 20:25 UTCJun 17, 04:05 UTC7h 40m
2026-06-16 UAL31 - Jun 16, 08:25 UTCJun 16, 16:55 UTC8h 30m
2026-06-15 UAL30 EWR → MUC Jun 15, 21:09 UTCJun 16, 04:20 UTC7h 10m
2026-06-14 UAL963 - Jun 14, 07:50 UTCJun 14, 16:20 UTC8h 30m
2026-06-14 UAL963 BER → EWR Jun 14, 08:01 UTCJun 14, 16:31 UTC8h 30m
2026-06-13 UAL962 EWR → BER Jun 13, 22:00 UTCJun 14, 05:05 UTC7h 5m
2026-06-13 UAL963 - Jun 13, 08:05 UTCJun 13, 16:30 UTC8h 25m

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 N684UA page for operator, model, and routing details .

Mode-S A913D6 frequently asked

What is Mode-S code A913D6?
A913D6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N684UA.
Where is Mode-S A913D6 registered?
Mode-S code A913D6 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 A913D6 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 16:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A913D6, octal 52211726, decimal 11,080,662.
What flights does A913D6 operate?
Mode-S A913D6 has broadcast 20 distinct callsigns, including UAL957, UAL956, UAL920, UAL959, UAL929.