Apparatus

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sensors Mode-S transponder

A13608

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17730 · BOEING 737-700 · operated by UNITED AIRLINES INC

Hex
A13608
Octal
50233010
Decimal
10,565,128
Country
US
Tail
N17730
Type
B737
Broadcasting now · callsign UAL2454 · 400 ft
Flights observed
437
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:20 UTC

Current position

A13608 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A13608 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
UAL1690 United Airlines 10 2026-07-23
UAL1861 United Airlines 8 2026-07-26
UAL2186 United Airlines 7 2026-07-24
UAL1793 United Airlines 7 2026-07-25
UAL1444 United Airlines 7 2026-04-19
UAL315 United Airlines 6 2026-04-19
UAL307 United Airlines 6 2026-07-25
UAL1946 United Airlines 6 2026-07-25
UAL1144 - 6 2026-06-29
UAL661 United Airlines 5 2026-07-03
UAL593 United Airlines 5 2026-07-23
UAL2485 - 5 2026-07-20
UAL2465 - 5 2026-07-17
UAL2454 - 5 2026-07-04
UAL2063 - 5 2026-07-17
UAL1888 - 5 2026-07-13
UAL1669 - 5 2026-07-23
UAL1307 United Airlines 5 2026-07-23
UAL1304 United Airlines 5 2026-07-21
UAL752 United Airlines 4 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1860 SFO → LAS Jul 26, 17:40 UTCJul 26, 19:20 UTC1h 40m
2026-07-26 UAL1861 ONT → IAH Jul 26, 14:45 UTCJul 26, 16:30 UTC1h 45m
2026-07-26 UAL1859 IAD → BTV Jul 26, 10:25 UTCJul 26, 12:50 UTC2h 25m
2026-07-25 UAL1946 ORD → LGA Jul 25, 23:55 UTCJul 26, 00:55 UTC1h 0m
2026-07-25 UAL307 SEA → EWR Jul 25, 14:35 UTCJul 25, 21:10 UTC6h 35m
2026-07-25 UAL1793 EWR → ORD Jul 25, 10:45 UTCJul 25, 12:15 UTC1h 30m
2026-07-25 UAL2160 PHX → SFO Jul 25, 01:22 UTCJul 25, 02:38 UTC1h 16m
2026-07-25 UAL2160 PHX → SFO Jul 25, 01:20 UTCJul 25, 02:35 UTC1h 15m
2026-07-24 UAL654 AUS → IAD Jul 24, 21:45 UTCJul 24, 23:20 UTC1h 35m
2026-07-24 UAL752 LAX → IAH Jul 24, 19:00 UTCJul 24, 20:20 UTC1h 20m
2026-07-24 UAL1448 SAN → SFO Jul 24, 14:15 UTCJul 24, 15:55 UTC1h 40m
2026-07-24 UAL1890 LAX → EWR Jul 24, 11:30 UTCJul 24, 12:45 UTC1h 15m
2026-07-24 UAL2186 EWR → MSY Jul 24, 04:30 UTCJul 24, 09:15 UTC4h 45m
2026-07-23 UAL1690 EWR → PBI Jul 23, 21:20 UTCJul 24, 02:45 UTC5h 25m
2026-07-23 UAL1076 DEN → SFO Jul 23, 18:55 UTCJul 23, 19:55 UTC1h 0m
2026-07-23 UAL1669 EWR → BOS Jul 23, 16:15 UTCJul 23, 17:00 UTC45m
2026-07-23 UAL1307 EWR → BUF Jul 23, 14:15 UTCJul 23, 15:05 UTC50m
2026-07-23 UAL1307 EWR → BUF Jul 23, 13:50 UTCJul 23, 15:03 UTC1h 13m
2026-07-23 UAL593 EWR → BOS Jul 23, 11:19 UTCJul 23, 11:52 UTC33m
2026-07-23 UAL593 EWR → BOS Jul 23, 11:15 UTCJul 23, 11:50 UTC35m
2026-07-23 UAL2186 EWR → MSY Jul 23, 04:50 UTCJul 23, 09:30 UTC4h 40m
2026-07-22 UAL1690 EWR → PBI Jul 22, 22:30 UTCJul 23, 03:36 UTC5h 6m
2026-07-22 UAL1690 EWR → PBI Jul 22, 22:25 UTCJul 23, 03:40 UTC5h 15m
2026-07-22 UAL1076 DEN → SFO Jul 22, 19:01 UTCJul 22, 19:57 UTC56m
2026-07-22 UAL1076 DEN → SFO Jul 22, 19:05 UTCJul 22, 20:00 UTC55m
2026-07-22 UAL1669 EWR → BOS Jul 22, 16:21 UTCJul 22, 16:57 UTC36m
2026-07-22 UAL1669 EWR → BOS Jul 22, 16:15 UTCJul 22, 17:00 UTC45m
2026-07-22 UAL1307 EWR → BUF Jul 22, 13:50 UTCJul 22, 14:35 UTC45m
2026-07-22 UAL593 EWR → BOS Jul 22, 11:15 UTCJul 22, 12:00 UTC45m
2026-07-21 UAL1559 EWR → SAT Jul 21, 21:10 UTCJul 22, 02:05 UTC4h 55m
2026-07-21 UAL1304 EWR → CHS Jul 21, 14:00 UTCJul 21, 17:35 UTC3h 35m
2026-07-21 UAL1793 EWR → ORD Jul 21, 10:35 UTCJul 21, 12:30 UTC1h 55m
2026-07-21 UAL1793 EWR → ORD Jul 21, 10:44 UTCJul 21, 12:12 UTC1h 28m
2026-07-21 UAL2160 PHX → SFO Jul 21, 01:55 UTCJul 21, 03:20 UTC1h 25m
2026-07-20 UAL630 BUF → ORD Jul 20, 22:00 UTCJul 20, 23:55 UTC1h 54m
2026-07-20 UAL2485 - Jul 20, 18:50 UTCJul 20, 20:20 UTC1h 30m
2026-07-19 UAL2612 EWR → PHX Jul 19, 23:55 UTCJul 20, 16:55 UTC17h 0m
2026-07-19 UAL2186 EWR → MSY Jul 19, 16:25 UTCJul 19, 21:30 UTC5h 5m
2026-07-18 UAL1304 - Jul 18, 14:55 UTCJul 18, 18:20 UTC3h 25m
2026-07-18 UAL1499 - Jul 18, 11:55 UTCJul 18, 12:45 UTC50m
2026-07-18 UAL8100 ORD → CID Jul 18, 02:25 UTCJul 18, 03:00 UTC36m
2026-07-17 UAL291 SAV → ORD Jul 17, 22:29 UTCJul 18, 00:50 UTC2h 20m
2026-07-17 UAL2631 ORD → SAV Jul 17, 16:04 UTCJul 17, 17:50 UTC1h 45m
2026-07-17 UAL2465 BNA → ORD Jul 17, 12:55 UTCJul 17, 14:10 UTC1h 15m
2026-07-17 UAL2063 ORD → BNA Jul 17, 01:35 UTCJul 17, 02:45 UTC1h 10m
2026-07-16 UAL1884 BNA → ORD Jul 16, 22:40 UTCJul 17, 00:04 UTC1h 25m
2026-07-16 UAL1928 ORD → BNA Jul 16, 20:19 UTCJul 16, 21:15 UTC55m
2026-07-16 UAL576 - Jul 16, 17:05 UTCJul 16, 17:54 UTC50m
2026-07-16 UAL576 MSP → ORD Jul 16, 16:49 UTCJul 16, 17:46 UTC57m
2026-07-16 UAL2805 ORD → MSP Jul 16, 14:20 UTCJul 16, 15:19 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 N17730 page for operator, model, and routing details .

Mode-S A13608 frequently asked

What is Mode-S code A13608?
A13608 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17730.
Where is Mode-S A13608 registered?
Mode-S code A13608 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 A13608 broadcasting right now?
Yes. Mode-S A13608 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A13608, octal 50233010, decimal 10,565,128.
What flights does A13608 operate?
Mode-S A13608 has broadcast 20 distinct callsigns, including UAL1690, UAL1861, UAL2186, UAL1793, UAL1444.