Apparatus

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sensors Mode-S transponder

0A0021

ICAO 24-bit transponder address · allocated to Algeria

Currently assigned to 7T-VJO · BOEING 737-800

Hex
0A0021
Octal
02400041
Decimal
655,393
Country
DZ
Tail
7T-VJO
Type
B738
No current signal · last broadcast Jul 26, 18:35 UTC
Flights observed
419
Distinct callsigns
20
Country
DZ
Last broadcast
Jul 26, 18:35 UTC

Last known position

Most recent position reported by Mode-S 0A0021.

Country allocation

The ICAO 24-bit address 0A0021 falls within the block assigned to Algeria (DZ) by ICAO Annex 10, Volume III. Every aircraft registered in Algeria 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
DAH1081 - 9 2026-07-15
DAH1068 - 9 2026-07-15
DAH6107 Air Algerie 8 2026-07-23
DAH2015 - 8 2026-07-07
DAH2014 - 8 2026-07-07
DAH1069 - 8 2026-07-15
DAH2055 - 7 2026-07-06
DAH2054 - 7 2026-07-06
DAH1085 Air Algerie 7 2026-07-22
DAH1084 - 7 2026-07-22
DAH2056 Air Algerie 6 2026-06-08
DAH1080 - 6 2026-07-15
DAH1011 - 6 2026-07-17
DAH1010 Air Algerie 6 2026-07-17
DAH3023 - 5 2026-07-13
DAH2063 - 5 2026-07-20
DAH2047 Air Algerie 5 2026-07-24
DAH2046 Air Algerie 5 2026-07-24
DAH2017 - 5 2026-07-02
DAH2016 - 5 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAH2009 VLC → ALG Jul 26, 18:00 UTCJul 26, 18:35 UTC35m
2026-07-26 DAH2008 ALG → VLC Jul 26, 16:10 UTCJul 26, 16:55 UTC45m
2026-07-26 DAH1037 LYS → ALG Jul 26, 13:20 UTCJul 26, 14:30 UTC1h 10m
2026-07-26 DAH1036 ALG → LYS Jul 26, 10:50 UTCJul 26, 12:00 UTC1h 10m
2026-07-26 DAH1009 ORY → ALG Jul 26, 06:10 UTCJul 26, 07:45 UTC1h 36m
2026-07-25 DAH1008 ALG → ORY Jul 25, 18:00 UTCJul 25, 19:55 UTC1h 55m
2026-07-25 DAH2001 PMI → ALG Jul 25, 15:55 UTCJul 25, 16:30 UTC35m
2026-07-25 DAH2000 ALG → PMI Jul 25, 13:50 UTCJul 25, 14:10 UTC20m
2026-07-25 DAH4000 ALG → TUN Jul 25, 06:35 UTCJul 25, 09:35 UTC3h 0m
2026-07-25 DAH6225 OGX → ALG Jul 25, 00:35 UTCJul 25, 00:55 UTC20m
2026-07-24 DAH2047 GVA → ALG Jul 24, 18:55 UTCJul 24, 20:15 UTC1h 20m
2026-07-24 DAH2046 ALG → GVA Jul 24, 16:05 UTCJul 24, 17:40 UTC1h 35m
2026-07-23 DAH3015 IST → ALG Jul 23, 23:40 UTCJul 24, 02:40 UTC3h 0m
2026-07-23 DAH3014 ALG → IST Jul 23, 19:30 UTCJul 23, 22:10 UTC2h 40m
2026-07-23 DAH1217 ETZ → ALG Jul 23, 14:55 UTCJul 23, 16:50 UTC1h 55m
2026-07-23 DAH1216 ALG → ETZ Jul 23, 11:45 UTCJul 23, 13:50 UTC2h 5m
2026-07-23 DAH6107 ORN → ALG Jul 23, 06:50 UTCJul 23, 07:15 UTC25m
2026-07-22 DAH1085 CDG → ORN Jul 22, 18:55 UTCJul 22, 20:55 UTC2h 0m
2026-07-22 DAH1084 - Jul 22, 15:30 UTCJul 22, 17:25 UTC1h 55m
2026-07-22 DAH1077 TLS → ORN Jul 22, 12:35 UTCJul 22, 13:55 UTC1h 20m
2026-07-22 DAH1076 ORN → TLS Jul 22, 11:10 UTCJul 22, 11:30 UTC20m
2026-07-21 DAH1235 CDG → ALG Jul 21, 19:45 UTCJul 21, 21:30 UTC1h 45m
2026-07-21 DAH1234 ALG → CDG Jul 21, 16:15 UTCJul 21, 18:15 UTC2h 0m
2026-07-21 DAH2025 - Jul 21, 12:55 UTCJul 21, 14:10 UTC1h 15m
2026-07-21 DAH2024 ALG → FCO Jul 21, 10:10 UTCJul 21, 11:15 UTC1h 5m
2026-07-21 DAH1009 ORY → ALG Jul 21, 05:50 UTCJul 21, 07:25 UTC1h 35m
2026-07-20 DAH1008 ALG → ORY Jul 20, 18:05 UTCJul 20, 19:55 UTC1h 50m
2026-07-20 DAH2063 - Jul 20, 16:25 UTCJul 20, 17:05 UTC40m
2026-07-20 DAH2063 - Jul 20, 13:40 UTCJul 20, 15:50 UTC2h 10m
2026-07-20 DAH2062 ALG → BRU Jul 20, 09:45 UTCJul 20, 11:55 UTC2h 10m
2026-07-19 DAH3017 - Jul 19, 14:30 UTCJul 19, 16:40 UTC2h 10m
2026-07-19 DAH3016 - Jul 19, 05:50 UTCJul 19, 12:50 UTC7h 0m
2026-07-18 DAH1008 ALG → ORY Jul 18, 18:50 UTCJul 18, 20:50 UTC2h 0m
2026-07-18 DAH2047 - Jul 18, 15:30 UTCJul 18, 17:00 UTC1h 30m
2026-07-18 DAH2046 - Jul 18, 12:25 UTCJul 18, 13:45 UTC1h 20m
2026-07-17 DAH2071 - Jul 17, 20:50 UTCJul 17, 22:45 UTC1h 55m
2026-07-17 DAH2070 - Jul 17, 17:09 UTCJul 17, 19:09 UTC2h 0m
2026-07-17 DAH1011 - Jul 17, 12:04 UTCJul 17, 13:40 UTC1h 35m
2026-07-17 DAH1010 ALG → ORY Jul 17, 08:30 UTCJul 17, 10:15 UTC1h 45m
2026-07-17 DAH4709 DJE → ALG Jul 17, 05:20 UTCJul 17, 05:35 UTC15m
2026-07-17 DAH4708 ALG → DJE Jul 17, 03:25 UTCJul 17, 03:45 UTC20m
2026-07-16 DAH1027 - Jul 16, 19:20 UTCJul 16, 20:19 UTC1h 0m
2026-07-16 DAH1024 - Jul 16, 17:14 UTCJul 16, 18:19 UTC1h 5m
2026-07-16 DAH2001 - Jul 16, 15:05 UTCJul 16, 15:40 UTC35m
2026-07-16 DAH2000 - Jul 16, 12:55 UTCJul 16, 13:34 UTC40m
2026-07-16 DAH1023 - Jul 16, 10:15 UTCJul 16, 11:20 UTC1h 5m
2026-07-16 DAH1022 - Jul 16, 07:45 UTCJul 16, 08:50 UTC1h 5m
2026-07-16 DAH6107 - Jul 16, 05:00 UTCJul 16, 05:40 UTC40m
2026-07-15 DAH1081 - Jul 15, 19:05 UTCJul 15, 20:40 UTC1h 35m
2026-07-15 DAH1080 - Jul 15, 14:30 UTCJul 15, 16:10 UTC1h 40m

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 7T-VJO page for operator, model, and routing details .

Mode-S 0A0021 frequently asked

What is Mode-S code 0A0021?
0A0021 is an ICAO 24-bit transponder address. Allocated to Algeria. Assigned to 7T-VJO.
Where is Mode-S 0A0021 registered?
Mode-S code 0A0021 is allocated to Algeria (DZ). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 0A0021 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0A0021, octal 02400041, decimal 655,393.
What flights does 0A0021 operate?
Mode-S 0A0021 has broadcast 20 distinct callsigns, including DAH1081, DAH1068, DAH6107, DAH2015, DAH2014.