Apparatus

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sensors Mode-S transponder

77181F

ICAO 24-bit transponder address · allocated to Sri Lanka

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

Hex
77181F
Octal
35614037
Decimal
7,804,959
Country
LK
Tail
4R-EXR
Type
A320
No current signal · last broadcast 10h ago
Flights observed
145
Distinct callsigns
20
Country
LK
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S 77181F.

Country allocation

The ICAO 24-bit address 77181F 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 20 distinct

Callsign Airline Flights Last seen
EXV911 - 19 2026-07-13
EXV921 - 18 2026-06-16
EXV912 - 14 2026-07-13
EXV824 Expo Aviation 14 2026-05-31
EXV922 - 12 2026-06-20
EXV822 - 12 2026-07-09
EXV961 - 10 2026-07-13
EXV964 - 6 2026-07-10
EXV962 - 5 2026-07-07
EXV823 Expo Aviation 5 2026-05-03
EXV821 - 5 2026-07-09
EXV982 Expo Aviation 4 2026-04-25
EXV963 - 4 2026-07-10
EXV924 Expo Aviation 4 2026-06-24
EXV923 Expo Aviation 4 2026-06-11
EXV721 Expo Aviation 3 2026-04-26
EXV981 Expo Aviation 2 2026-05-01
EXV722 Expo Aviation 2 2026-04-26
EXV912D - 1 2026-07-10
EXV622 - 1 2026-05-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 EXV912 - Jul 13, 20:30 UTCJul 13, 21:50 UTC1h 20m
2026-07-13 EXV911 - Jul 13, 06:05 UTCJul 13, 19:00 UTC12h 55m
2026-07-13 EXV961 - Jul 13, 01:55 UTCJul 13, 03:40 UTC1h 45m
2026-07-10 EXV912D - Jul 10, 22:20 UTCJul 10, 23:40 UTC1h 20m
2026-07-10 EXV911 - Jul 10, 18:55 UTCJul 10, 20:40 UTC1h 45m
2026-07-10 EXV964 - Jul 10, 09:50 UTCJul 10, 10:50 UTC1h 0m
2026-07-10 EXV964 - Jul 10, 08:40 UTCJul 10, 09:10 UTC30m
2026-07-10 EXV963 - Jul 10, 05:55 UTCJul 10, 06:05 UTC10m
2026-07-10 EXV963 - Jul 10, 04:30 UTCJul 10, 05:10 UTC40m
2026-07-09 EXV822 - Jul 9, 22:20 UTCJul 10, 02:15 UTC3h 55m
2026-07-09 EXV821 - Jul 9, 11:20 UTCJul 9, 20:30 UTC9h 10m
2026-07-08 EXV912 - Jul 8, 20:25 UTCJul 9, 18:30 UTC22h 5m
2026-07-07 EXV911 - Jul 7, 23:50 UTCJul 8, 19:00 UTC19h 10m
2026-07-07 EXV962 - Jul 7, 22:30 UTCJul 8, 19:00 UTC20h 30m
2026-07-07 EXV961 - Jul 7, 02:05 UTCJul 7, 20:25 UTC18h 20m
2026-07-06 EXV961 - Jul 6, 21:50 UTCJul 7, 20:25 UTC22h 35m
2026-07-06 EXV912 - Jul 6, 20:40 UTCJul 7, 19:20 UTC22h 40m
2026-07-06 EXV911 - Jul 6, 11:25 UTCJul 6, 19:20 UTC7h 55m
2026-07-05 EXV962 - Jul 5, 22:30 UTCJul 6, 00:35 UTC2h 5m
2026-07-05 EXV961 - Jul 5, 02:10 UTCJul 5, 20:00 UTC17h 50m
2026-07-03 EXV822 - Jul 3, 19:45 UTCJul 3, 23:35 UTC3h 50m
2026-07-03 EXV964 - Jul 3, 01:20 UTCJul 3, 17:50 UTC16h 30m
2026-07-02 EXV964 - Jul 2, 21:50 UTCJul 3, 17:50 UTC20h 0m
2026-07-02 EXV912 - Jul 2, 20:30 UTCJul 3, 17:50 UTC21h 20m
2026-07-02 EXV911 - Jul 2, 11:10 UTCJul 2, 19:00 UTC7h 50m
2026-07-01 EXV911 DAC → DAC Jul 1, 20:25 UTCJul 2, 19:00 UTC22h 35m
2026-06-30 EXV911 - Jun 30, 23:50 UTCJul 1, 19:10 UTC19h 20m
2026-06-30 EXV961 - Jun 30, 20:05 UTCJun 30, 21:50 UTC1h 45m
2026-06-29 EXV961 - Jun 29, 23:49 UTCJun 30, 21:50 UTC22h 1m
2026-06-29 EXV822 - Jun 29, 22:00 UTCJun 30, 21:45 UTC23h 46m
2026-06-29 EXV822 - Jun 29, 19:49 UTCJun 29, 23:49 UTC4h 0m
2026-06-28 EXV962 - Jun 28, 22:15 UTCJun 29, 17:34 UTC19h 20m
2026-06-28 EXV961 - Jun 28, 02:10 UTCJun 28, 20:09 UTC18h 0m
2026-06-26 EXV822 - Jun 26, 20:34 UTCJun 27, 00:29 UTC3h 55m
2026-06-26 EXV821 - Jun 26, 14:05 UTCJun 26, 17:54 UTC3h 50m
2026-06-26 EXV964 - Jun 26, 05:19 UTCJun 26, 07:30 UTC2h 10m
2026-06-26 EXV963 - Jun 26, 01:24 UTCJun 26, 03:24 UTC2h 0m
2026-06-25 EXV822 - Jun 25, 19:34 UTCJun 25, 23:30 UTC3h 55m
2026-06-25 EXV821 - Jun 25, 13:55 UTCJun 25, 17:39 UTC3h 45m
2026-06-24 EXV924 MLE → CMB Jun 24, 11:34 UTCJun 24, 11:45 UTC10m
2026-06-23 EXV962 - Jun 23, 22:34 UTCJun 24, 00:44 UTC2h 10m
2026-06-23 EXV961 - Jun 23, 18:25 UTCJun 23, 19:24 UTC1h 0m
2026-06-21 EXV962 - Jun 21, 22:20 UTCJun 22, 00:29 UTC2h 10m
2026-06-20 EXV961 - Jun 20, 21:49 UTCJun 21, 20:09 UTC22h 20m
2026-06-20 EXV961 - Jun 20, 21:44 UTCJun 21, 19:29 UTC21h 45m
2026-06-20 EXV822 - Jun 20, 19:34 UTCJun 20, 20:00 UTC25m
2026-06-20 EXV821 - Jun 20, 17:44 UTCJun 20, 17:54 UTC10m
2026-06-20 EXV821 - Jun 20, 14:05 UTCJun 20, 15:49 UTC1h 45m
2026-06-20 EXV922 - Jun 20, 02:04 UTCJun 20, 04:59 UTC2h 55m
2026-06-19 EXV964 - Jun 19, 06:04 UTCJun 19, 08:14 UTC2h 10m

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-EXR page for operator, model, and routing details .

Mode-S 77181F frequently asked

What is Mode-S code 77181F?
77181F is an ICAO 24-bit transponder address. Allocated to Sri Lanka. Assigned to 4R-EXR.
Where is Mode-S 77181F registered?
Mode-S code 77181F 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 77181F broadcasting right now?
No active broadcast right now. Last signal was 10h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 77181F, octal 35614037, decimal 7,804,959.
What flights does 77181F operate?
Mode-S 77181F has broadcast 20 distinct callsigns, including EXV911, EXV921, EXV912, EXV824, EXV922.