Apparatus

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sensors Mode-S transponder

A46603

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N38268 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
A46603
Octal
51063003
Decimal
10,774,019
Country
US
Tail
N38268
Type
B738
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
508
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A46603.

Country allocation

The ICAO 24-bit address A46603 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
UAL2401 United Airlines 6 2026-06-12
UAL1896 - 6 2026-07-08
UAL2422 United Airlines 5 2026-06-12
UAL2309 United Airlines 5 2026-07-02
UAL1481 United Airlines 5 2026-06-09
UAL425 - 4 2026-07-15
UAL1522 - 4 2026-07-16
UAL1396 - 4 2026-06-22
UAL1297 United Airlines 4 2026-07-26
UAL1156 United Airlines 4 2026-07-25
UAL671 - 3 2026-07-13
UAL652 United Airlines 3 2026-05-20
UAL500 - 3 2026-06-29
UAL488 - 3 2026-06-26
UAL444 - 3 2026-07-02
UAL377 United Airlines 3 2026-05-28
UAL2627 United Airlines 3 2026-04-24
UAL2389 United Airlines 3 2026-05-17
UAL2227 United Airlines 3 2026-05-21
UAL1949 United Airlines 3 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1504 ORD → DCA Jul 26, 19:40 UTCJul 26, 21:45 UTC2h 5m
2026-07-26 UAL1775 SFO → PHX Jul 26, 16:25 UTCJul 26, 18:20 UTC1h 55m
2026-07-26 UAL1297 LAS → EWR Jul 26, 12:25 UTCJul 26, 14:10 UTC1h 45m
2026-07-26 UAL1297 LAS → EWR Jul 26, 12:19 UTCJul 26, 14:12 UTC1h 53m
2026-07-26 UAL1989 SFO → IAH Jul 26, 00:30 UTCJul 26, 02:00 UTC1h 30m
2026-07-25 UAL1156 IAD → EWR Jul 25, 20:50 UTCJul 25, 22:40 UTC1h 50m
2026-07-25 UAL1775 SFO → PHX Jul 25, 16:35 UTCJul 25, 18:10 UTC1h 35m
2026-07-25 UAL1297 LAS → EWR Jul 25, 12:45 UTCJul 25, 14:30 UTC1h 45m
2026-07-25 UAL1297 LAS → EWR Jul 25, 12:49 UTCJul 25, 14:12 UTC1h 23m
2026-07-25 UAL1989 SFO → IAH Jul 25, 00:15 UTCJul 25, 01:45 UTC1h 30m
2026-07-24 UAL1180 DEN → CID Jul 24, 13:45 UTCJul 24, 21:50 UTC8h 5m
2026-07-23 UAL1621 LAX → MCO Jul 23, 23:55 UTCJul 24, 02:25 UTC2h 30m
2026-07-23 UAL1811 ORD → BDL Jul 23, 18:15 UTCJul 23, 20:20 UTC2h 5m
2026-07-23 UAL1811 ORD → BDL Jul 23, 18:14 UTCJul 23, 20:13 UTC1h 59m
2026-07-23 UAL1929 YQX → HHN Jul 23, 15:00 UTCJul 23, 16:05 UTC1h 5m
2026-07-23 UAL2232 ORD → MSP Jul 23, 12:30 UTCJul 23, 13:35 UTC1h 5m
2026-07-23 UAL2094 IAH → LGA Jul 23, 05:55 UTCJul 23, 09:05 UTC3h 10m
2026-07-23 UAL2262 LAS → SFO Jul 23, 02:10 UTCJul 23, 03:30 UTC1h 20m
2026-07-22 UAL298 AUS → EWR Jul 22, 20:25 UTCJul 23, 00:40 UTC4h 15m
2026-07-22 UAL213 SFO → EWR Jul 22, 17:20 UTCJul 22, 18:50 UTC1h 30m
2026-07-22 UAL2098 BOS → IAD Jul 22, 13:55 UTCJul 22, 15:05 UTC1h 10m
2026-07-22 UAL2098 BOS → IAD Jul 22, 13:40 UTCJul 22, 15:06 UTC1h 26m
2026-07-22 UAL2466 SJC → DEN Jul 22, 03:06 UTCJul 22, 04:35 UTC1h 29m
2026-07-22 UAL2466 SJC → DEN Jul 22, 02:55 UTCJul 22, 04:40 UTC1h 45m
2026-07-21 UAL1968 ORD → BOS Jul 21, 14:45 UTCJul 21, 17:30 UTC2h 45m
2026-07-21 UAL1156 IAD → EWR Jul 21, 02:10 UTCJul 21, 05:30 UTC3h 20m
2026-07-20 UAL312 DSM → ORD Jul 20, 21:00 UTCJul 21, 00:00 UTC3h 0m
2026-07-20 UAL2342 - Jul 20, 16:25 UTCJul 20, 18:45 UTC2h 20m
2026-07-20 UAL1491 PHL → ORD Jul 20, 13:05 UTCJul 20, 14:10 UTC1h 5m
2026-07-20 UAL1491 PHL → ORD Jul 20, 13:07 UTCJul 20, 13:57 UTC50m
2026-07-20 UAL1596 PDX → SFO Jul 20, 03:20 UTCJul 20, 04:25 UTC1h 5m
2026-07-19 UAL2786 GEG → DEN Jul 19, 23:30 UTCJul 20, 01:15 UTC1h 45m
2026-07-19 UAL324 DEN → GEG Jul 19, 20:10 UTCJul 19, 22:10 UTC2h 0m
2026-07-19 UAL1315 EWR → FLL Jul 19, 16:50 UTCJul 19, 18:20 UTC1h 30m
2026-07-19 UAL1264 - Jul 19, 12:40 UTCJul 19, 15:05 UTC2h 25m
2026-07-19 UAL3918 EWR → SFO Jul 19, 04:30 UTCJul 19, 07:00 UTC2h 30m
2026-07-18 UAL2133 EWR → RSW Jul 18, 13:25 UTCJul 18, 17:30 UTC4h 5m
2026-07-18 UAL3926 - Jul 18, 01:39 UTCJul 18, 04:15 UTC2h 36m
2026-07-17 UAL8160 YYZ → DEL Jul 17, 00:18 UTCJul 17, 02:37 UTC2h 19m
2026-07-17 UAL8160 YYZ → DEL Jul 17, 00:04 UTCJul 17, 02:30 UTC2h 25m
2026-07-16 UAL2821 - Jul 16, 19:50 UTCJul 16, 21:50 UTC2h 0m
2026-07-16 UAL2821 IND → DEN Jul 16, 19:50 UTCJul 16, 21:48 UTC1h 58m
2026-07-16 UAL1522 - Jul 16, 16:19 UTCJul 16, 18:25 UTC2h 5m
2026-07-16 UAL2446 - Jul 16, 12:09 UTCJul 16, 14:00 UTC1h 50m
2026-07-16 UAL2028 DEN → ONT Jul 16, 02:00 UTCJul 16, 03:45 UTC1h 45m
2026-07-15 UAL1483 STL → DEN Jul 15, 22:05 UTCJul 15, 23:50 UTC1h 45m
2026-07-15 UAL2000 - Jul 15, 20:05 UTCJul 15, 20:50 UTC45m
2026-07-15 UAL1239 - Jul 15, 15:40 UTCJul 15, 17:10 UTC1h 30m
2026-07-15 UAL425 ORD → ATL Jul 15, 12:45 UTCJul 15, 14:10 UTC1h 25m
2026-07-15 UAL425 ORD → ATL Jul 15, 12:45 UTCJul 15, 14:12 UTC1h 27m

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 N38268 page for operator, model, and routing details .

Mode-S A46603 frequently asked

What is Mode-S code A46603?
A46603 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N38268.
Where is Mode-S A46603 registered?
Mode-S code A46603 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 A46603 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 A46603, octal 51063003, decimal 10,774,019.
What flights does A46603 operate?
Mode-S A46603 has broadcast 20 distinct callsigns, including UAL2401, UAL1896, UAL2422, UAL2309, UAL1481.