Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

78121F

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-1313 · BOEING 737-800

Hex
78121F
Octal
36011037
Decimal
7,868,959
Country
CN
Tail
B-1313
Type
B738
No current signal · last broadcast 1d ago
Flights observed
91
Distinct callsigns
20
Country
CN
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 78121F.

Country allocation

The ICAO 24-bit address 78121F falls within the block assigned to China (CN) by ICAO Annex 10, Volume III. Every aircraft registered in China 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
YZR7525 - 12 2026-07-10
YZR7526 - 11 2026-07-11
YZR7566 - 7 2026-07-13
YZR7579 Yangtze River Express 5 2026-05-11
YZR7573 - 5 2026-07-13
YZR7565 - 5 2026-07-12
YZR7537 Yangtze River Express 5 2026-05-10
YZR7563 Yangtze River Express 4 2026-05-20
YZR7528 - 4 2026-07-10
YZR7577 Yangtze River Express 3 2026-04-19
YZR7570 Yangtze River Express 3 2026-06-30
YZR7569 - 3 2026-06-30
YZR7527 - 3 2026-07-10
YZR7574 - 2 2026-06-28
YZR7536 - 2 2026-07-04
YZR7533 Yangtze River Express 2 2026-04-29
YZR7596 Yangtze River Express 1 2026-06-23
YZR7595 Yangtze River Express 1 2026-04-19
YZR7591 Yangtze River Express 1 2026-05-19
YZR7587 Yangtze River Express 1 2026-05-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 YZR7573 - Jul 13, 08:50 UTCJul 13, 09:00 UTC10m
2026-07-13 YZR7566 - Jul 13, 06:40 UTCJul 13, 07:20 UTC40m
2026-07-12 YZR7565 - Jul 12, 04:35 UTCJul 12, 04:45 UTC10m
2026-07-11 YZR7526 - Jul 11, 22:10 UTCJul 11, 22:25 UTC15m
2026-07-10 YZR7525 - Jul 10, 22:20 UTCJul 10, 22:30 UTC10m
2026-07-10 YZR7528 - Jul 10, 14:50 UTCJul 10, 15:10 UTC20m
2026-07-10 YZR7527 - Jul 10, 01:50 UTCJul 10, 02:00 UTC10m
2026-07-08 YZR7526 - Jul 8, 19:15 UTCJul 8, 19:40 UTC25m
2026-07-05 YZR7525 - Jul 5, 22:25 UTCJul 5, 22:35 UTC10m
2026-07-05 YZR7526 - Jul 5, 19:45 UTCJul 5, 20:05 UTC20m
2026-07-04 YZR7525 - Jul 4, 22:35 UTCJul 4, 22:45 UTC10m
2026-07-04 YZR7536 - Jul 4, 17:10 UTCJul 4, 17:30 UTC20m
2026-07-04 YZR7535 - Jul 4, 12:30 UTCJul 4, 12:40 UTC10m
2026-07-04 YZR7566 - Jul 4, 10:45 UTCJul 4, 10:55 UTC10m
2026-07-02 YZR7508 - Jul 2, 04:10 UTCJul 2, 04:20 UTC10m
2026-06-30 YZR7565 - Jun 30, 23:00 UTCJun 30, 23:15 UTC15m
2026-06-30 YZR7570 CGO → SZX Jun 30, 17:30 UTCJun 30, 17:45 UTC15m
2026-06-30 YZR7569 - Jun 30, 01:35 UTCJun 30, 01:45 UTC10m
2026-06-28 YZR7525 - Jun 28, 22:24 UTCJun 28, 22:34 UTC10m
2026-06-28 YZR7574 - Jun 28, 15:29 UTCJun 28, 15:40 UTC10m
2026-06-28 YZR7573 - Jun 28, 11:39 UTCJun 28, 11:50 UTC10m
2026-06-28 YZR7566 - Jun 28, 10:15 UTCJun 28, 10:30 UTC15m
2026-06-26 YZR7565 - Jun 26, 23:00 UTCJun 26, 23:09 UTC10m
2026-06-25 YZR7536 NGB → SZX Jun 25, 18:34 UTCJun 25, 18:50 UTC15m
2026-06-25 YZR7566 - Jun 25, 07:25 UTCJun 25, 07:34 UTC10m
2026-06-24 YZR7566 - Jun 24, 13:30 UTCJun 25, 06:44 UTC17h 15m
2026-06-23 YZR7501 - Jun 23, 09:20 UTCJun 23, 13:00 UTC3h 40m
2026-06-23 YZR7596 HAK → PVG Jun 23, 04:25 UTCJun 23, 04:35 UTC10m
2026-06-22 YZR7548 - Jun 22, 16:40 UTCJun 22, 17:29 UTC50m
2026-06-20 YZR7565 - Jun 20, 22:45 UTCJun 20, 22:54 UTC10m
2026-06-20 YZR7526 - Jun 20, 17:14 UTCJun 20, 17:29 UTC15m
2026-06-19 YZR7525 - Jun 19, 22:24 UTCJun 19, 22:34 UTC10m
2026-06-19 YZR7526 - Jun 19, 17:19 UTCJun 19, 17:39 UTC20m
2026-06-18 YZR7525 - Jun 18, 22:30 UTCJun 18, 22:40 UTC10m
2026-06-18 YZR7528 HET → SZX Jun 18, 20:25 UTCJun 18, 20:40 UTC15m
2026-06-17 YZR7528 HET → SZX Jun 17, 14:45 UTCJun 17, 15:00 UTC15m
2026-06-16 YZR7527 - Jun 16, 22:55 UTCJun 16, 23:05 UTC10m
2026-06-16 YZR1313 - Jun 16, 18:35 UTCJun 16, 18:50 UTC15m
2026-05-26 YZR7532 HGH → SZX May 26, 16:10 UTCMay 26, 16:40 UTC30m
2026-05-26 YZR7531 SZX → HGH May 26, 01:10 UTCMay 26, 10:20 UTC9h 10m
2026-05-24 YZR7526 TNA → SZX May 24, 18:00 UTCMay 24, 18:20 UTC20m
2026-05-23 YZR7525 SZX → TNA May 23, 22:25 UTCMay 23, 22:35 UTC10m
2026-05-20 YZR7563 SZX → LNL May 20, 04:20 UTCMay 20, 04:30 UTC10m
2026-05-19 YZR7591 SZX → ACX May 19, 22:40 UTCMay 19, 22:55 UTC15m
2026-05-19 YZR7570 - May 19, 16:40 UTCMay 19, 17:05 UTC25m
2026-05-19 YZR7569 SZX → CGO May 19, 01:35 UTCMay 19, 01:45 UTC10m
2026-05-18 YZR7526 TNA → SZX May 18, 17:05 UTCMay 18, 17:20 UTC15m
2026-05-17 YZR7525 SZX → TNA May 17, 22:25 UTCMay 17, 22:40 UTC15m
2026-05-17 YZR7526 TNA → SZX May 17, 17:35 UTCMay 17, 17:45 UTC10m
2026-05-16 YZR7525 SZX → TNA May 16, 22:30 UTCMay 16, 22:40 UTC10m

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 B-1313 page for operator, model, and routing details .

Mode-S 78121F frequently asked

What is Mode-S code 78121F?
78121F is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-1313.
Where is Mode-S 78121F registered?
Mode-S code 78121F is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 78121F broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 78121F, octal 36011037, decimal 7,868,959.
What flights does 78121F operate?
Mode-S 78121F has broadcast 20 distinct callsigns, including YZR7525, YZR7526, YZR7566, YZR7579, YZR7573.