Apparatus

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sensors Mode-S transponder

A620B7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N494UA · AIRBUS A-320 · operated by UNITED AIRLINES INC

Hex
A620B7
Octal
51420267
Decimal
10,887,351
Country
US
Tail
N494UA
Type
A320
No current signal · last broadcast Jul 26, 19:50 UTC
Flights observed
410
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:50 UTC

Last known position

Most recent position reported by Mode-S A620B7.

Country allocation

The ICAO 24-bit address A620B7 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
UAL697 United Airlines 6 2026-06-06
UAL1564 - 6 2026-07-13
UAL739 - 5 2026-06-28
UAL2479 - 5 2026-07-02
UAL1823 - 5 2026-07-02
UAL1583 United Airlines 5 2026-07-17
UAL1460 United Airlines 5 2026-07-19
UAL1305 United Airlines 5 2026-06-09
UAL397 United Airlines 4 2026-06-09
UAL247 United Airlines 4 2026-06-28
UAL2333 - 4 2026-06-30
UAL224 - 4 2026-07-18
UAL2193 - 4 2026-07-11
UAL1747 - 4 2026-07-02
UAL1436 United Airlines 4 2026-07-21
UAL1184 United Airlines 4 2026-04-16
UAL1180 United Airlines 4 2026-06-15
UAL609 - 3 2026-06-28
UAL561 - 3 2026-07-16
UAL421 United Airlines 3 2026-05-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1874 SFO → IND Jul 26, 18:30 UTCJul 26, 19:40 UTC1h 10m
2026-07-25 UAL325 DEN → BOS Jul 25, 23:05 UTCJul 26, 01:10 UTC2h 5m
2026-07-25 UAL325 DEN → BOS Jul 25, 19:15 UTCJul 25, 21:15 UTC2h 0m
2026-07-25 UAL1896 SEA → SFO Jul 25, 16:15 UTCJul 25, 17:10 UTC55m
2026-07-25 UAL790 DEN → AUS Jul 25, 11:20 UTCJul 25, 14:30 UTC3h 10m
2026-07-25 UAL2478 SAN → ORD Jul 25, 05:00 UTCJul 25, 08:15 UTC3h 15m
2026-07-24 UAL1702 BDL → IAH Jul 24, 21:40 UTCJul 25, 03:00 UTC5h 20m
2026-07-24 UAL1578 IAH → LAX Jul 24, 15:40 UTCJul 24, 17:30 UTC1h 50m
2026-07-24 UAL1577 RNO → SFO Jul 24, 03:00 UTCJul 24, 04:40 UTC1h 40m
2026-07-24 UAL1577 RNO → SFO Jul 24, 03:09 UTCJul 24, 04:36 UTC1h 27m
2026-07-23 UAL442 DEN → LGA Jul 23, 22:35 UTCJul 24, 01:45 UTC3h 10m
2026-07-23 UAL1326 SFO → BNA Jul 23, 16:40 UTCJul 23, 19:50 UTC3h 10m
2026-07-23 UAL790 DEN → AUS Jul 23, 11:20 UTCJul 23, 14:35 UTC3h 15m
2026-07-23 UAL1722 OGG → SFO Jul 23, 06:40 UTCJul 23, 09:40 UTC3h 0m
2026-07-23 UAL649 SFO → EWR Jul 23, 02:30 UTCJul 23, 04:05 UTC1h 35m
2026-07-22 UAL2602 ORD → MSN Jul 22, 23:50 UTCJul 23, 01:25 UTC1h 35m
2026-07-22 UAL248 BOS → IAH Jul 22, 19:15 UTCJul 22, 20:45 UTC1h 30m
2026-07-22 UAL355 BUR → SFO Jul 22, 16:00 UTCJul 22, 17:35 UTC1h 35m
2026-07-22 UAL1767 DEN → DCA Jul 22, 13:30 UTCJul 22, 14:05 UTC35m
2026-07-22 UAL2781 HNL → EWR Jul 22, 01:40 UTCJul 22, 02:05 UTC25m
2026-07-21 UAL720 PHL → DEN Jul 21, 21:10 UTCJul 21, 23:45 UTC2h 35m
2026-07-21 UAL2787 GUM → SFO Jul 21, 17:05 UTCJul 21, 19:35 UTC2h 30m
2026-07-21 UAL2838 HKG → SFO Jul 21, 14:31 UTCJul 21, 15:35 UTC1h 4m
2026-07-21 UAL2838 HKG → SFO Jul 21, 14:30 UTCJul 21, 15:40 UTC1h 10m
2026-07-21 UAL1436 BOS → ORD Jul 21, 00:40 UTCJul 21, 01:45 UTC1h 5m
2026-07-20 UAL1762 SDF → DEN Jul 20, 19:40 UTCJul 20, 22:40 UTC3h 0m
2026-07-20 UAL1762 SDF → DEN Jul 20, 19:35 UTCJul 20, 22:36 UTC3h 1m
2026-07-20 UAL2427 ORD → SXM Jul 20, 16:35 UTCJul 20, 18:20 UTC1h 45m
2026-07-20 UAL786 - Jul 20, 12:30 UTCJul 20, 14:00 UTC1h 30m
2026-07-20 UAL2762 SFO → FTW Jul 20, 02:55 UTCJul 20, 04:15 UTC1h 20m
2026-07-19 UAL1639 - Jul 19, 23:20 UTCJul 20, 00:10 UTC50m
2026-07-19 UAL1639 DEN → STL Jul 19, 20:15 UTCJul 19, 21:55 UTC1h 40m
2026-07-19 UAL1327 ATL → DEN Jul 19, 16:00 UTCJul 19, 18:30 UTC2h 30m
2026-07-19 UAL2739 IAD → ATL Jul 19, 13:30 UTCJul 19, 14:45 UTC1h 15m
2026-07-19 UAL1524 IAH → EWR Jul 19, 10:20 UTCJul 19, 10:55 UTC35m
2026-07-19 UAL2677 CLE → DEN Jul 19, 08:15 UTCJul 19, 08:39 UTC24m
2026-07-19 UAL2677 CLE → DEN Jul 19, 08:10 UTCJul 19, 08:45 UTC35m
2026-07-19 UAL1460 SFO → DEN Jul 19, 05:35 UTCJul 19, 06:45 UTC1h 10m
2026-07-19 UAL2264 IAD → BNA Jul 19, 00:00 UTCJul 19, 01:30 UTC1h 30m
2026-07-18 UAL358 SFO → LAS Jul 18, 17:50 UTCJul 18, 21:30 UTC3h 40m
2026-07-18 UAL528 - Jul 18, 14:35 UTCJul 18, 16:20 UTC1h 45m
2026-07-18 UAL224 - Jul 18, 10:15 UTCJul 18, 11:45 UTC1h 30m
2026-07-17 UAL1583 IAH → LGA Jul 17, 23:52 UTCJul 18, 01:22 UTC1h 30m
2026-07-17 UAL1583 IAH → LGA Jul 17, 23:45 UTCJul 18, 01:20 UTC1h 35m
2026-07-17 UAL1655 YYC → ORD Jul 17, 18:50 UTCJul 17, 21:55 UTC3h 5m
2026-07-17 UAL764 - Jul 17, 14:15 UTCJul 17, 17:20 UTC3h 5m
2026-07-17 UAL224 - Jul 17, 10:20 UTCJul 17, 11:50 UTC1h 30m
2026-07-17 UAL1583 IAH → LGA Jul 17, 00:14 UTCJul 17, 01:39 UTC1h 25m
2026-07-16 UAL2792 - Jul 16, 20:49 UTCJul 16, 22:00 UTC1h 10m
2026-07-16 UAL561 - Jul 16, 18:25 UTCJul 16, 19:25 UTC1h 0m

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 N494UA page for operator, model, and routing details .

Mode-S A620B7 frequently asked

What is Mode-S code A620B7?
A620B7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N494UA.
Where is Mode-S A620B7 registered?
Mode-S code A620B7 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 A620B7 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A620B7, octal 51420267, decimal 10,887,351.
What flights does A620B7 operate?
Mode-S A620B7 has broadcast 20 distinct callsigns, including UAL697, UAL1564, UAL739, UAL2479, UAL1823.