Apparatus

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sensors Mode-S transponder

77170D

ICAO 24-bit transponder address · allocated to Sri Lanka

Currently assigned to 4R-EXS · AIRBUS A-320

Hex
77170D
Octal
35613415
Decimal
7,804,685
Country
LK
Tail
4R-EXS
Type
A320
No current signal · last broadcast Jul 26, 20:15 UTC
Flights observed
185
Distinct callsigns
16
Country
LK
Last broadcast
Jul 26, 20:15 UTC

Last known position

Most recent position reported by Mode-S 77170D.

Country allocation

The ICAO 24-bit address 77170D falls within the block assigned to Sri Lanka (LK) by ICAO Annex 10, Volume III. Every aircraft registered in Sri Lanka 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 16 distinct

Callsign Airline Flights Last seen
EXV911 Expo Aviation 74 2026-07-23
EXV912 Expo Aviation 46 2026-07-24
EXV821 Expo Aviation 22 2026-07-26
EXV822 Expo Aviation 14 2026-07-26
EXV823 Expo Aviation 6 2026-05-07
EXV722 Expo Aviation 5 2026-05-03
EXV824 Expo Aviation 4 2026-04-26
EXV962 Expo Aviation 3 2026-07-22
EXV721 Expo Aviation 3 2026-05-02
EXV921 Expo Aviation 2 2026-05-08
EXV964 - 1 2026-07-16
EXV961 - 1 2026-07-14
EXV923 Expo Aviation 1 2026-04-30
EXV922 Expo Aviation 1 2026-04-26
EXV821D - 1 2026-07-20
EV923 - 1 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 EXV822 DXB → CMB Jul 26, 19:45 UTCJul 26, 20:15 UTC30m
2026-07-26 EXV821 CMB → DXB Jul 26, 17:10 UTCJul 26, 17:30 UTC20m
2026-07-25 EXV822 DXB → CMB Jul 25, 22:00 UTCJul 26, 15:30 UTC17h 31m
2026-07-25 EXV822 DXB → CMB Jul 25, 19:55 UTCJul 26, 15:30 UTC19h 36m
2026-07-24 EXV821 CMB → DXB Jul 24, 21:20 UTCJul 25, 15:40 UTC18h 20m
2026-07-24 EXV912 DAC → CMB Jul 24, 20:40 UTCJul 25, 15:40 UTC19h 0m
2026-07-23 EXV911 CMB → DAC Jul 23, 21:20 UTCJul 24, 19:10 UTC21h 50m
2026-07-23 EXV912 DAC → CMB Jul 23, 20:30 UTCJul 24, 19:10 UTC22h 40m
2026-07-22 EXV911 CMB → DAC Jul 22, 21:20 UTCJul 23, 19:15 UTC21h 55m
2026-07-22 EXV912 DAC → CMB Jul 22, 20:30 UTCJul 22, 21:50 UTC1h 20m
2026-07-22 EXV911 CMB → DAC Jul 22, 17:35 UTCJul 22, 19:05 UTC1h 30m
2026-07-22 EXV962 AMD → CMB Jul 22, 00:10 UTCJul 22, 02:15 UTC2h 5m
2026-07-21 EXV822 DXB → CMB Jul 21, 14:05 UTCJul 21, 22:05 UTC8h 0m
2026-07-20 EXV912 DAC → CMB Jul 20, 23:25 UTCJul 21, 12:40 UTC13h 14m
2026-07-20 EXV911 CMB → DAC Jul 20, 08:30 UTCJul 20, 22:15 UTC13h 45m
2026-07-20 EXV821D - Jul 20, 06:05 UTCJul 20, 06:25 UTC20m
2026-07-19 EXV962 - Jul 19, 22:05 UTCJul 20, 04:30 UTC6h 25m
2026-07-19 EXV912 DAC → CMB Jul 19, 08:15 UTCJul 19, 20:05 UTC11h 50m
2026-07-19 EXV911 CMB → DAC Jul 19, 05:30 UTCJul 19, 07:00 UTC1h 30m
2026-07-18 EXV822 DXB → CMB Jul 18, 22:25 UTCJul 19, 02:25 UTC4h 0m
2026-07-18 EXV821 CMB → DXB Jul 18, 01:50 UTCJul 18, 20:05 UTC18h 16m
2026-07-17 EXV821 CMB → DXB Jul 17, 21:20 UTCJul 18, 20:05 UTC22h 46m
2026-07-17 EXV912 - Jul 17, 20:40 UTCJul 18, 18:10 UTC21h 31m
2026-07-17 EXV911 - Jul 17, 17:40 UTCJul 17, 19:09 UTC1h 30m
2026-07-16 EXV964 - Jul 16, 20:39 UTCJul 17, 13:29 UTC16h 50m
2026-07-16 EXV911 - Jul 16, 17:40 UTCJul 16, 19:10 UTC1h 30m
2026-07-15 EXV911 - Jul 15, 21:20 UTCJul 16, 19:10 UTC21h 50m
2026-07-15 EXV912 - Jul 15, 20:20 UTCJul 15, 21:40 UTC1h 20m
2026-07-15 EXV911 - Jul 15, 17:40 UTCJul 15, 19:10 UTC1h 30m
2026-07-14 EXV962 - Jul 14, 22:20 UTCJul 15, 00:35 UTC2h 14m
2026-07-14 EXV961 - Jul 14, 02:00 UTCJul 14, 20:10 UTC18h 10m
2026-07-13 EXV822 - Jul 13, 19:45 UTCJul 13, 23:40 UTC3h 55m
2026-07-13 EXV821 - Jul 13, 17:10 UTCJul 13, 17:35 UTC25m
2026-07-13 EXV821 - Jul 13, 14:05 UTCJul 13, 15:30 UTC1h 25m
2026-07-12 EXV822 - Jul 12, 19:40 UTCJul 12, 23:35 UTC3h 55m
2026-07-12 EXV821 - Jul 12, 01:55 UTCJul 12, 17:30 UTC15h 35m
2026-07-11 EXV821 - Jul 11, 21:20 UTCJul 12, 17:30 UTC20h 10m
2026-07-11 EXV912 - Jul 11, 20:45 UTCJul 12, 17:30 UTC20h 45m
2026-07-11 EXV911 - Jul 11, 02:55 UTCJul 11, 19:00 UTC16h 5m
2026-07-10 EXV822 - Jul 10, 19:35 UTCJul 10, 23:25 UTC3h 50m
2026-07-10 EXV821 - Jul 10, 02:10 UTCJul 10, 17:40 UTC15h 30m
2026-07-09 EXV911 - Jul 9, 19:00 UTCJul 9, 20:30 UTC1h 30m
2026-07-08 EXV822 - Jul 8, 20:05 UTCJul 8, 23:45 UTC3h 40m
2026-07-08 EXV821 - Jul 8, 14:00 UTCJul 8, 17:30 UTC3h 30m
2026-07-07 EXV821 - Jul 7, 21:20 UTCJul 8, 17:30 UTC20h 10m
2026-07-07 EXV912 - Jul 7, 20:25 UTCJul 8, 17:30 UTC21h 5m
2026-07-07 EXV911 - Jul 7, 17:40 UTCJul 7, 19:05 UTC1h 25m
2026-07-06 EXV822 - Jul 6, 19:35 UTCJul 6, 23:30 UTC3h 55m
2026-07-05 EXV821 - Jul 5, 23:20 UTCJul 6, 18:05 UTC18h 45m
2026-07-05 EXV821 - Jul 5, 21:50 UTCJul 6, 18:05 UTC20h 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 4R-EXS page for operator, model, and routing details .

Mode-S 77170D frequently asked

What is Mode-S code 77170D?
77170D is an ICAO 24-bit transponder address. Allocated to Sri Lanka. Assigned to 4R-EXS.
Where is Mode-S 77170D registered?
Mode-S code 77170D is allocated to Sri Lanka (LK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 77170D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 77170D, octal 35613415, decimal 7,804,685.
What flights does 77170D operate?
Mode-S 77170D has broadcast 16 distinct callsigns, including EXV911, EXV912, EXV821, EXV822, EXV823.