Apparatus

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sensors Mode-S transponder

AC81D3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N905AV · operated by UMB BANK NA TRUSTEE

Hex
AC81D3
Octal
53100723
Decimal
11,305,427
Country
US
Tail
N905AV
Type
A20N
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
356
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S AC81D3.

Country allocation

The ICAO 24-bit address AC81D3 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
LRC651 LACSA 13 2026-07-21
LRC640 - 13 2026-07-17
TAI563 - 12 2026-07-11
TAI562 - 12 2026-07-11
TAI553 - 12 2026-07-23
TAI552 Avianca El Salvador 12 2026-07-23
LRC650 LACSA 12 2026-07-17
TAI561 - 10 2026-07-16
LRC641 - 10 2026-07-17
TAI560 - 9 2026-07-15
TAI444 Avianca El Salvador 8 2026-07-24
LRC604 - 8 2026-06-21
TAI445 Avianca El Salvador 7 2026-07-24
TAI569 - 6 2026-07-14
TAI568 - 6 2026-07-14
TAI325 - 6 2026-06-16
TAI324 - 6 2026-06-16
LRC655 LACSA 6 2026-07-26
LRC605 - 6 2026-06-21
TAI578 Avianca El Salvador 5 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 LRC652 SJO → HAV Jul 26, 22:40 UTCJul 26, 22:45 UTC5m
2026-07-26 LRC698 BOG → SJO Jul 26, 19:25 UTCJul 26, 21:10 UTC1h 45m
2026-07-26 LRC697 SJO → BOG Jul 26, 15:35 UTCJul 26, 17:15 UTC1h 40m
2026-07-26 LRC655 GUA → SJO Jul 26, 13:00 UTCJul 26, 14:10 UTC1h 10m
2026-07-26 LRC655 GUA → SJO Jul 26, 07:45 UTCJul 26, 11:30 UTC3h 45m
2026-07-26 LRC654 GUA → IAD Jul 26, 02:10 UTCJul 26, 05:55 UTC3h 45m
2026-07-25 TAI320 SJO → SAL Jul 25, 23:40 UTCJul 26, 00:00 UTC20m
2026-07-25 TAI367 IAH → SAL Jul 25, 19:10 UTCJul 25, 21:35 UTC2h 25m
2026-07-25 TAI368 SAL → IAH Jul 25, 14:20 UTCJul 25, 16:50 UTC2h 30m
2026-07-25 TAI579 GUA → SAL Jul 25, 11:25 UTCJul 25, 11:45 UTC20m
2026-07-25 TAI578 SAL → GUA Jul 25, 04:45 UTCJul 25, 05:05 UTC20m
2026-07-24 TAI445 BOS → SAL Jul 24, 22:20 UTCJul 25, 02:45 UTC4h 25m
2026-07-24 TAI444 SAL → BOS Jul 24, 14:25 UTCJul 24, 18:50 UTC4h 25m
2026-07-24 TAI529 LAX → SAL Jul 24, 07:50 UTCJul 24, 12:20 UTC4h 30m
2026-07-24 TAI528 SAL → LAX Jul 24, 00:40 UTCJul 24, 05:05 UTC4h 25m
2026-07-23 TAI553 - Jul 23, 21:20 UTCJul 23, 21:40 UTC20m
2026-07-23 TAI553 SFO → GUA Jul 23, 15:00 UTCJul 23, 20:15 UTC5h 15m
2026-07-23 TAI552 SAL → GUA Jul 23, 07:25 UTCJul 23, 12:15 UTC4h 50m
2026-07-23 TAI552 SAL → GUA Jul 23, 05:25 UTCJul 23, 05:45 UTC20m
2026-07-22 TAI329 YUL → SAL Jul 22, 21:00 UTCJul 23, 01:40 UTC4h 40m
2026-07-22 TAI328 SAL → YUL Jul 22, 14:05 UTCJul 22, 18:40 UTC4h 35m
2026-07-21 LRC610 SJO → SAL Jul 21, 21:15 UTCJul 21, 21:35 UTC20m
2026-07-21 LRC668 CTG → SJO Jul 21, 18:35 UTCJul 21, 20:00 UTC1h 25m
2026-07-21 LRC669 SJO → CTG Jul 21, 16:10 UTCJul 21, 17:30 UTC1h 20m
2026-07-21 LRC696 BOG → SJO Jul 21, 12:55 UTCJul 21, 14:40 UTC1h 45m
2026-07-21 LRC693 SJO → BOG Jul 21, 07:50 UTCJul 21, 09:15 UTC1h 25m
2026-07-21 LRC651 CUN → SAL Jul 21, 03:50 UTCJul 21, 05:00 UTC1h 10m
2026-07-21 LRC631 - Jul 21, 00:25 UTCJul 21, 00:35 UTC10m
2026-07-20 LRC631 - Jul 20, 20:50 UTCJul 20, 23:50 UTC3h 0m
2026-07-20 LRC630 GUA → ORD Jul 20, 14:20 UTCJul 20, 18:25 UTC4h 5m
2026-07-20 TAI578 SAL → GUA Jul 20, 04:35 UTCJul 20, 04:55 UTC20m
2026-07-20 TAI312 SJO → SAL Jul 20, 01:55 UTCJul 20, 02:15 UTC20m
2026-07-19 TAI311 MIA → SAL Jul 19, 20:20 UTCJul 20, 00:55 UTC4h 35m
2026-07-19 TAI396 - Jul 19, 11:15 UTCJul 19, 17:35 UTC6h 20m
2026-07-18 LRC651 CUN → SAL Jul 18, 21:25 UTCJul 19, 05:40 UTC8h 15m
2026-07-18 LRC668 CTG → SJO Jul 18, 18:45 UTCJul 18, 20:10 UTC1h 25m
2026-07-18 LRC669 SJO → CTG Jul 18, 16:10 UTCJul 18, 17:30 UTC1h 20m
2026-07-18 LRC696 BOG → SJO Jul 18, 12:50 UTCJul 18, 14:40 UTC1h 50m
2026-07-18 LRC693 SJO → BOG Jul 18, 07:55 UTCJul 18, 09:45 UTC1h 50m
2026-07-18 LRC651 CUN → SAL Jul 18, 04:00 UTCJul 18, 05:10 UTC1h 10m
2026-07-17 LRC641 LAX → GUA Jul 17, 21:50 UTCJul 18, 02:19 UTC4h 30m
2026-07-17 LRC640 GUA → LAX Jul 17, 15:10 UTCJul 17, 20:00 UTC4h 50m
2026-07-17 LRC650 SJO → GUA Jul 17, 11:45 UTCJul 17, 13:00 UTC1h 15m
2026-07-17 LRC651 - Jul 17, 06:25 UTCJul 17, 06:50 UTC25m
2026-07-16 TAI445 - Jul 16, 22:40 UTCJul 17, 03:20 UTC4h 40m
2026-07-16 TAI444 - Jul 16, 14:25 UTCJul 16, 19:05 UTC4h 40m
2026-07-16 TAI561 - Jul 16, 07:20 UTCJul 16, 12:25 UTC5h 5m
2026-07-15 TAI560 - Jul 15, 23:45 UTCJul 16, 05:10 UTC5h 25m
2026-07-15 TAI555 - Jul 15, 21:45 UTCJul 15, 22:05 UTC20m
2026-07-15 LRC651 CUN → GUA Jul 15, 19:15 UTCJul 15, 20:30 UTC1h 15m

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 N905AV page for operator, model, and routing details .

Mode-S AC81D3 frequently asked

What is Mode-S code AC81D3?
AC81D3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N905AV.
Where is Mode-S AC81D3 registered?
Mode-S code AC81D3 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 AC81D3 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC81D3, octal 53100723, decimal 11,305,427.
What flights does AC81D3 operate?
Mode-S AC81D3 has broadcast 20 distinct callsigns, including LRC651, LRC640, TAI563, TAI562, TAI553.