Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A1CDD8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N215UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
A1CDD8
Octal
50346730
Decimal
10,603,992
Country
US
Tail
N215UA
Type
B772
No current signal · last broadcast 9h ago
Flights observed
234
Distinct callsigns
20
Country
US
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S A1CDD8.

Country allocation

The ICAO 24-bit address A1CDD8 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
UAL1158 - 20 2026-07-04
UAL1169 - 16 2026-07-04
UAL300 - 15 2026-07-07
UAL1157 United Airlines 14 2026-07-02
UAL2358 United Airlines 13 2026-07-05
UAL1170 - 13 2026-07-04
UAL604 United Airlines 11 2026-07-05
UAL252 - 11 2026-07-01
UAL1818 - 11 2026-07-05
UAL253 - 10 2026-07-01
UAL1509 United Airlines 8 2026-04-26
UAL2610 - 7 2026-06-29
UAL2480 - 7 2026-07-13
UAL2475 - 6 2026-06-15
UAL2280 United Airlines 6 2026-06-15
UAL1722 United Airlines 6 2026-05-13
UAL1141 United Airlines 6 2026-04-27
UAL368 - 5 2026-06-15
UAL1777 United Airlines 5 2026-06-07
UAL2278 United Airlines 4 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 UAL2480 SFO → ORD Jul 13, 22:30 UTCJul 14, 02:00 UTC3h 30m
2026-07-09 UAL3933 DEN → SFO Jul 9, 18:09 UTCJul 9, 20:06 UTC1h 57m
2026-07-09 UAL3933 DEN → SFO Jul 9, 18:00 UTCJul 9, 20:10 UTC2h 10m
2026-07-08 UAL383 - Jul 8, 06:00 UTCJul 8, 11:55 UTC5h 55m
2026-07-07 UAL300 - Jul 7, 21:25 UTCJul 8, 01:55 UTC4h 30m
2026-07-07 UAL1147 IAD → SFO Jul 7, 13:00 UTCJul 7, 18:00 UTC5h 0m
2026-07-06 UAL1791 SFO → IAD Jul 6, 20:35 UTCJul 7, 01:15 UTC4h 40m
2026-07-06 UAL1791 SFO → IAD Jul 6, 20:42 UTCJul 7, 01:13 UTC4h 31m
2026-07-06 UAL1147 - Jul 6, 13:30 UTCJul 6, 18:20 UTC4h 50m
2026-07-05 UAL8291 SFO → IAD Jul 5, 20:35 UTCJul 6, 01:05 UTC4h 30m
2026-07-05 UAL2358 SAN → EWR Jul 5, 14:55 UTCJul 5, 18:15 UTC3h 20m
2026-07-05 UAL604 DEN → SYR Jul 5, 08:25 UTCJul 5, 11:30 UTC3h 5m
2026-07-05 UAL1818 - Jul 5, 03:30 UTCJul 5, 04:10 UTC40m
2026-07-04 UAL1818 - Jul 4, 23:45 UTCJul 5, 00:00 UTC15m
2026-07-04 UAL1818 HNL → SFO Jul 4, 23:45 UTCJul 5, 04:07 UTC4h 22m
2026-07-04 UAL1158 - Jul 4, 16:40 UTCJul 4, 21:50 UTC5h 10m
2026-07-04 UAL1169 - Jul 4, 07:55 UTCJul 4, 12:30 UTC4h 35m
2026-07-04 UAL1169 HNL → LAX Jul 4, 07:59 UTCJul 4, 12:13 UTC4h 14m
2026-07-04 UAL1170 - Jul 4, 00:35 UTCJul 4, 05:50 UTC5h 15m
2026-07-04 UAL1170 LAX → HNL Jul 4, 00:21 UTCJul 4, 05:50 UTC5h 29m
2026-07-02 UAL1157 BOS → IAD Jul 2, 23:15 UTCJul 3, 03:50 UTC4h 35m
2026-07-01 UAL253 - Jul 1, 15:45 UTCJul 1, 23:45 UTC8h 0m
2026-07-01 UAL252 - Jul 1, 06:10 UTCJul 1, 13:10 UTC7h 0m
2026-07-01 UAL252 HNL → IAH Jul 1, 06:08 UTCJul 1, 13:07 UTC6h 59m
2026-06-30 UAL300 - Jun 30, 21:15 UTCJul 1, 02:10 UTC4h 55m
2026-06-30 UAL1147 - Jun 30, 13:05 UTCJun 30, 18:00 UTC4h 55m
2026-06-29 UAL1791 SFO → IAD Jun 29, 21:05 UTCJun 30, 01:25 UTC4h 20m
2026-06-29 UAL2610 - Jun 29, 15:09 UTCJun 29, 19:05 UTC3h 55m
2026-06-28 UAL2480 SFO → ORD Jun 28, 22:34 UTCJun 29, 02:00 UTC3h 25m
2026-06-28 UAL2358 SAN → EWR Jun 28, 15:05 UTCJun 28, 18:34 UTC3h 30m
2026-06-28 UAL2358 SAN → EWR Jun 28, 15:08 UTCJun 28, 18:24 UTC3h 16m
2026-06-28 UAL604 DEN → SYR Jun 28, 07:54 UTCJun 28, 11:04 UTC3h 10m
2026-06-27 UAL1818 - Jun 27, 23:55 UTCJun 28, 04:40 UTC4h 45m
2026-06-27 UAL1158 - Jun 27, 16:59 UTCJun 27, 17:29 UTC30m
2026-06-27 UAL1158 LAX → HNL Jun 27, 16:21 UTCJun 27, 21:53 UTC5h 32m
2026-06-26 UAL1157 BOS → IAD Jun 26, 23:19 UTCJun 27, 04:19 UTC5h 0m
2026-06-25 UAL384 DEN → HNL Jun 25, 18:33 UTCJun 26, 00:49 UTC6h 16m
2026-06-25 UAL384 DEN → HNL Jun 25, 18:19 UTCJun 25, 20:45 UTC2h 25m
2026-06-24 UAL1735 OGG → DEN Jun 24, 06:15 UTCJun 24, 12:04 UTC5h 49m
2026-06-23 UAL1736 - Jun 23, 18:14 UTCJun 24, 11:59 UTC17h 45m
2026-06-23 UAL383 - Jun 23, 06:24 UTCJun 23, 12:20 UTC5h 55m
2026-06-22 UAL300 - Jun 22, 21:25 UTCJun 23, 02:20 UTC4h 55m
2026-06-22 UAL2358 SAN → EWR Jun 22, 15:45 UTCJun 22, 19:14 UTC3h 30m
2026-06-22 UAL604 DEN → SYR Jun 22, 08:10 UTCJun 22, 11:14 UTC3h 5m
2026-06-22 UAL1818 - Jun 22, 01:10 UTCJun 22, 05:40 UTC4h 30m
2026-06-21 UAL1158 - Jun 21, 18:00 UTCJun 21, 23:10 UTC5h 10m
2026-06-21 UAL1169 - Jun 21, 11:59 UTCJun 21, 12:35 UTC35m
2026-06-21 UAL1169 - Jun 21, 07:59 UTCJun 21, 08:10 UTC10m
2026-06-21 UAL1170 - Jun 21, 05:04 UTCJun 21, 05:25 UTC20m
2026-06-21 UAL1170 - Jun 21, 00:25 UTCJun 21, 00:55 UTC30m

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 N215UA page for operator, model, and routing details .

Mode-S A1CDD8 frequently asked

What is Mode-S code A1CDD8?
A1CDD8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N215UA.
Where is Mode-S A1CDD8 registered?
Mode-S code A1CDD8 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 A1CDD8 broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1CDD8, octal 50346730, decimal 10,603,992.
What flights does A1CDD8 operate?
Mode-S A1CDD8 has broadcast 20 distinct callsigns, including UAL1158, UAL1169, UAL300, UAL1157, UAL2358.