Apparatus

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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
Broadcasting now · callsign UAL755 · 37,000 ft
Flights observed
257
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 12:00 UTC

Current position

A1CDD8 is currently broadcasting. Map zoomed to live position.

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
UAL300 - 17 2026-07-14
UAL1169 - 16 2026-07-04
UAL1157 - 15 2026-07-21
UAL1170 United Airlines 14 2026-07-23
UAL2358 United Airlines 13 2026-07-05
UAL604 United Airlines 11 2026-07-05
UAL252 - 11 2026-07-01
UAL1818 - 11 2026-07-05
UAL253 - 10 2026-07-01
UAL2610 - 9 2026-07-14
UAL1509 United Airlines 8 2026-04-26
UAL2480 - 7 2026-07-13
UAL2475 - 6 2026-06-15
UAL2280 United Airlines 6 2026-06-15
UAL1736 United Airlines 6 2026-07-26
UAL1735 United Airlines 6 2026-07-26
UAL1722 United Airlines 6 2026-05-13
UAL1141 United Airlines 6 2026-04-27
UAL368 - 5 2026-06-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1735 LAS → EWR Jul 26, 09:30 UTCJul 26, 11:50 UTC2h 20m
2026-07-26 UAL1735 LAS → EWR Jul 26, 06:15 UTCJul 26, 11:46 UTC5h 31m
2026-07-26 UAL1736 DEN → OGG Jul 26, 00:55 UTCJul 26, 01:05 UTC10m
2026-07-25 UAL1736 DEN → OGG Jul 25, 18:30 UTCJul 25, 20:40 UTC2h 10m
2026-07-23 UAL1806 MCI → EWR Jul 23, 11:45 UTCJul 23, 14:00 UTC2h 15m
2026-07-23 UAL1806 MCI → EWR Jul 23, 08:15 UTCJul 23, 08:25 UTC10m
2026-07-23 UAL1806 MCI → EWR Jul 23, 07:59 UTCJul 23, 14:00 UTC6h 1m
2026-07-23 UAL1170 LAX → HNL Jul 23, 00:35 UTCJul 23, 05:50 UTC5h 15m
2026-07-21 UAL1157 - Jul 21, 23:35 UTCJul 22, 04:10 UTC4h 35m
2026-07-21 UAL1805 LAS → EWR Jul 21, 11:10 UTCJul 21, 11:25 UTC15m
2026-07-21 UAL1805 LAS → EWR Jul 21, 04:25 UTCJul 21, 07:10 UTC2h 45m
2026-07-20 UAL1735 LAS → EWR Jul 20, 09:45 UTCJul 20, 12:00 UTC2h 15m
2026-07-19 UAL1736 DEN → OGG Jul 19, 18:35 UTCJul 20, 01:01 UTC6h 26m
2026-07-19 UAL1736 - Jul 19, 18:30 UTCJul 19, 20:45 UTC2h 15m
2026-07-19 UAL1735 LAS → EWR Jul 19, 06:15 UTCJul 19, 11:59 UTC5h 44m
2026-07-18 UAL1736 - Jul 18, 18:20 UTCJul 18, 20:40 UTC2h 20m
2026-07-15 UAL1735 - Jul 15, 18:20 UTCJul 16, 12:09 UTC17h 50m
2026-07-15 UAL383 - Jul 15, 09:30 UTCJul 15, 11:50 UTC2h 20m
2026-07-15 UAL383 - Jul 15, 06:00 UTCJul 15, 06:15 UTC15m
2026-07-14 UAL300 SFO → HNL Jul 14, 21:22 UTCJul 15, 02:11 UTC4h 49m
2026-07-14 UAL300 - Jul 14, 21:20 UTCJul 14, 21:50 UTC30m
2026-07-14 UAL2610 ORD → SFO Jul 14, 14:40 UTCJul 14, 18:10 UTC3h 30m
2026-07-14 UAL2610 ORD → SFO Jul 14, 14:21 UTCJul 14, 18:01 UTC3h 40m
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

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?
Yes. Mode-S A1CDD8 is currently airborne.
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, UAL300, UAL1169, UAL1157, UAL1170.