Apparatus

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sensors Mode-S transponder

A923CD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N68834 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A923CD
Octal
52221715
Decimal
11,084,749
Country
US
Tail
N68834
Type
B739
Broadcasting now · callsign UAL498 · 34,000 ft
Flights observed
339
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:10 UTC

Current position

A923CD is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A923CD 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
UAL1801 United Airlines 4 2026-04-24
UAL1686 United Airlines 4 2026-06-08
UAL1344 - 4 2026-07-04
UAL8152 United Airlines 3 2026-04-17
UAL433 - 3 2026-07-02
UAL403 - 3 2026-07-04
UAL2737 United Airlines 3 2026-04-30
UAL2719 - 3 2026-07-20
UAL2331 United Airlines 3 2026-06-03
UAL2101 United Airlines 3 2026-04-15
UAL1893 - 3 2026-07-24
UAL1864 - 3 2026-07-18
UAL1615 United Airlines 3 2026-06-09
UAL1502 United Airlines 3 2026-07-22
UAL1490 United Airlines 3 2026-07-23
UAL1392 United Airlines 3 2026-04-17
UAL1275 United Airlines 3 2026-04-15
UAL1128 United Airlines 3 2026-07-18
UAL841 United Airlines 2 2026-04-26
UAL8165 United Airlines 2 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1520 MCO → DEN Jul 26, 16:55 UTCJul 26, 20:10 UTC3h 15m
2026-07-26 UAL2321 SFO → EWR Jul 26, 12:10 UTCJul 26, 15:25 UTC3h 15m
2026-07-26 UAL1236 EWR → PHX Jul 26, 00:55 UTCJul 26, 03:10 UTC2h 15m
2026-07-25 UAL1767 DEN → DCA Jul 25, 20:35 UTCJul 25, 23:05 UTC2h 30m
2026-07-25 UAL2476 SAN → DEN Jul 25, 16:05 UTCJul 25, 18:00 UTC1h 55m
2026-07-25 UAL8135 CLE → YYZ Jul 25, 03:55 UTCJul 25, 05:40 UTC1h 45m
2026-07-24 UAL2146 LAX → DEN Jul 24, 23:50 UTCJul 25, 01:50 UTC2h 0m
2026-07-24 UAL1689 IAH → SFO Jul 24, 17:50 UTCJul 24, 22:30 UTC4h 40m
2026-07-24 UAL1893 MCO → IAD Jul 24, 13:45 UTCJul 24, 15:25 UTC1h 40m
2026-07-23 UAL2463 ORD → MCO Jul 23, 22:00 UTCJul 24, 00:00 UTC2h 0m
2026-07-23 UAL721 EWR → MCO Jul 23, 18:35 UTCJul 23, 19:50 UTC1h 15m
2026-07-23 UAL1117 ORD → BOS Jul 23, 14:50 UTCJul 23, 16:40 UTC1h 50m
2026-07-23 UAL1490 SFO → BOI Jul 23, 06:55 UTCJul 23, 10:15 UTC3h 20m
2026-07-23 UAL2738 IAD → EWR Jul 23, 01:10 UTCJul 23, 05:10 UTC4h 0m
2026-07-22 UAL1673 CLE → ORD Jul 22, 22:35 UTCJul 22, 23:35 UTC1h 0m
2026-07-22 UAL1502 EWR → ORD Jul 22, 19:40 UTCJul 22, 20:25 UTC45m
2026-07-22 UAL1410 IAH → PHL Jul 22, 16:40 UTCJul 22, 17:25 UTC45m
2026-07-22 UAL1803 CHS → EWR Jul 22, 14:05 UTCJul 22, 14:55 UTC50m
2026-07-22 UAL2102 DFW → EWR Jul 22, 11:10 UTCJul 22, 11:25 UTC15m
2026-07-22 UAL8153 MYR → EWR Jul 22, 02:50 UTCJul 22, 10:25 UTC7h 35m
2026-07-21 UAL1635 LAX → IAD Jul 21, 20:00 UTCJul 22, 00:40 UTC4h 40m
2026-07-21 UAL1653 - Jul 21, 13:15 UTCJul 21, 17:30 UTC4h 15m
2026-07-21 UAL1653 CUN → LAX Jul 21, 13:14 UTCJul 21, 17:23 UTC4h 9m
2026-07-21 UAL1145 SFO → CUN Jul 21, 07:03 UTCJul 21, 11:50 UTC4h 47m
2026-07-21 UAL1145 SFO → CUN Jul 21, 07:00 UTCJul 21, 11:55 UTC4h 55m
2026-07-21 UAL2194 ORD → SJC Jul 21, 01:25 UTCJul 21, 05:20 UTC3h 55m
2026-07-20 UAL782 SAT → EWR Jul 20, 20:14 UTCJul 20, 22:37 UTC2h 23m
2026-07-20 UAL782 SAT → EWR Jul 20, 20:05 UTCJul 20, 22:45 UTC2h 40m
2026-07-20 UAL663 DEN → ABQ Jul 20, 16:00 UTCJul 20, 18:15 UTC2h 15m
2026-07-20 UAL2719 EWR → MCO Jul 20, 12:06 UTCJul 20, 14:06 UTC2h 0m
2026-07-20 UAL2719 EWR → MCO Jul 20, 11:55 UTCJul 20, 14:05 UTC2h 10m
2026-07-20 UAL554 EWR → DFW Jul 20, 00:35 UTCJul 20, 01:50 UTC1h 15m
2026-07-20 UAL554 EWR → DFW Jul 20, 00:27 UTCJul 20, 01:48 UTC1h 21m
2026-07-19 UAL8172 - Jul 19, 21:50 UTCJul 19, 23:00 UTC1h 10m
2026-07-19 UAL1340 FLL → EWR Jul 19, 16:15 UTCJul 19, 20:00 UTC3h 45m
2026-07-19 UAL2438 - Jul 19, 11:20 UTCJul 19, 14:15 UTC2h 55m
2026-07-19 UAL2438 EWR → IAH Jul 19, 11:19 UTCJul 19, 14:14 UTC2h 55m
2026-07-18 UAL1864 - Jul 18, 11:40 UTCJul 18, 14:25 UTC2h 45m
2026-07-18 UAL1864 EWR → LAS Jul 18, 11:22 UTCJul 18, 14:24 UTC3h 2m
2026-07-18 UAL1128 SFO → EWR Jul 18, 01:08 UTCJul 18, 03:51 UTC2h 43m
2026-07-18 UAL1128 SFO → EWR Jul 18, 01:30 UTCJul 18, 03:55 UTC2h 26m
2026-07-17 UAL1800 - Jul 17, 20:35 UTCJul 17, 22:55 UTC2h 20m
2026-07-17 UAL677 EWR → FLL Jul 17, 16:34 UTCJul 17, 18:55 UTC2h 20m
2026-07-17 UAL1847 DFW → EWR Jul 17, 11:30 UTCJul 17, 14:24 UTC2h 55m
2026-07-17 UAL424 EWR → DFW Jul 17, 01:55 UTCJul 17, 04:54 UTC3h 0m
2026-07-16 UAL1190 PHX → EWR Jul 16, 19:35 UTCJul 17, 00:14 UTC4h 40m
2026-07-16 UAL1895 - Jul 16, 15:45 UTCJul 16, 18:10 UTC2h 25m
2026-07-16 UAL387 - Jul 16, 02:30 UTCJul 16, 05:25 UTC2h 55m
2026-07-15 UAL1743 - Jul 15, 22:05 UTCJul 16, 01:15 UTC3h 10m
2026-07-15 UAL334 - Jul 15, 19:40 UTCJul 15, 20:15 UTC35m

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 N68834 page for operator, model, and routing details .

Mode-S A923CD frequently asked

What is Mode-S code A923CD?
A923CD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N68834.
Where is Mode-S A923CD registered?
Mode-S code A923CD 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 A923CD broadcasting right now?
Yes. Mode-S A923CD is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A923CD, octal 52221715, decimal 11,084,749.
What flights does A923CD operate?
Mode-S A923CD has broadcast 20 distinct callsigns, including UAL1801, UAL1686, UAL1344, UAL8152, UAL433.