Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AC4963

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N891DN · BOEING 737-900 · operated by DELTA AIR LINES INC

Hex
AC4963
Octal
53044543
Decimal
11,290,979
Country
US
Tail
N891DN
Type
B739
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
521
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S AC4963.

Country allocation

The ICAO 24-bit address AC4963 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
DAL1913 Delta Air Lines 10 2026-06-03
DAL2042 - 9 2026-06-18
DAL1542 Delta Air Lines 9 2026-07-25
DAL2500 - 8 2026-06-19
DAL1730 Delta Air Lines 8 2026-07-24
DAL1643 - 8 2026-06-16
DAL902 Delta Air Lines 6 2026-06-05
DAL449 - 6 2026-07-05
DAL3157 - 5 2026-06-30
DAL3128 Delta Air Lines 5 2026-05-22
DAL2951 - 5 2026-07-12
DAL1004 Delta Air Lines 5 2026-05-21
DAL866 Delta Air Lines 4 2026-04-16
DAL732 Delta Air Lines 4 2026-04-17
DAL714 - 4 2026-04-13
DAL689 Delta Air Lines 4 2026-05-25
DAL481 - 4 2026-06-19
DAL444 Delta Air Lines 4 2026-04-29
DAL2253 Delta Air Lines 4 2026-07-05
DAL2180 Delta Air Lines 4 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL402 LGA → ATL Jul 26, 22:20 UTCJul 26, 22:45 UTC25m
2026-07-26 DAL402 LGA → ATL Jul 26, 17:55 UTCJul 26, 20:50 UTC2h 55m
2026-07-26 DAL2916 SLC → MSP Jul 26, 14:20 UTCJul 26, 16:20 UTC2h 0m
2026-07-26 DAL491 PHX → ATL Jul 26, 11:24 UTCJul 26, 12:21 UTC57m
2026-07-25 DAL2954 PBI → LGA Jul 25, 23:45 UTCJul 26, 12:20 UTC12h 36m
2026-07-25 DAL630 ANC → MSP Jul 25, 16:50 UTCJul 25, 19:30 UTC2h 40m
2026-07-25 DAL2261 ATL → BDL Jul 25, 12:20 UTCJul 25, 15:10 UTC2h 50m
2026-07-25 DAL1542 ATL → CVG Jul 25, 00:30 UTCJul 25, 03:10 UTC2h 40m
2026-07-25 DAL1542 ATL → CVG Jul 25, 00:27 UTCJul 25, 03:01 UTC2h 34m
2026-07-24 DAL1542 ATL → CVG Jul 24, 20:15 UTCJul 24, 23:05 UTC2h 50m
2026-07-24 DAL1730 DTW → ALB Jul 24, 15:30 UTCJul 24, 18:35 UTC3h 5m
2026-07-24 DAL1730 DTW → ALB Jul 24, 11:00 UTCJul 24, 13:40 UTC2h 40m
2026-07-24 DAL1542 ATL → CVG Jul 24, 00:25 UTCJul 24, 03:00 UTC2h 35m
2026-07-23 DAL1542 ATL → CVG Jul 23, 20:05 UTCJul 23, 22:55 UTC2h 50m
2026-07-23 DAL1730 DTW → ALB Jul 23, 15:30 UTCJul 23, 18:35 UTC3h 5m
2026-07-23 DAL1730 DTW → ALB Jul 23, 15:30 UTCJul 23, 18:28 UTC2h 58m
2026-07-23 DAL1730 DTW → ALB Jul 23, 11:05 UTCJul 23, 13:40 UTC2h 35m
2026-07-23 DAL1542 ATL → CVG Jul 23, 00:25 UTCJul 23, 03:00 UTC2h 35m
2026-07-22 DAL1542 ATL → CVG Jul 22, 20:05 UTCJul 22, 22:50 UTC2h 45m
2026-07-22 DAL1730 DTW → ALB Jul 22, 15:35 UTCJul 22, 18:35 UTC3h 0m
2026-07-22 DAL1730 DTW → ALB Jul 22, 15:32 UTCJul 22, 18:37 UTC3h 5m
2026-07-22 DAL1730 DTW → ALB Jul 22, 11:15 UTCJul 22, 13:50 UTC2h 35m
2026-07-22 DAL1542 ATL → CVG Jul 22, 00:30 UTCJul 22, 03:05 UTC2h 35m
2026-07-21 DAL1542 ATL → CVG Jul 21, 20:05 UTCJul 21, 22:50 UTC2h 45m
2026-07-21 DAL2697 BOS → MCO Jul 21, 16:45 UTCJul 21, 18:10 UTC1h 25m
2026-07-20 DAL894 MSY → DTW Jul 20, 22:30 UTCJul 21, 00:40 UTC2h 10m
2026-07-20 DAL3146 ATL → MSY Jul 20, 19:50 UTCJul 20, 20:50 UTC1h 0m
2026-07-20 DAL1147 ORD → ATL Jul 20, 16:50 UTCJul 20, 18:10 UTC1h 20m
2026-07-20 DAL1147 ORD → ATL Jul 20, 16:47 UTCJul 20, 18:08 UTC1h 21m
2026-07-20 DAL1147 ORD → ATL Jul 20, 13:25 UTCJul 20, 14:55 UTC1h 30m
2026-07-20 DAL3112 ATL → SAV Jul 20, 02:00 UTCJul 20, 02:40 UTC40m
2026-07-19 DAL3112 ATL → SAV Jul 19, 23:45 UTCJul 20, 00:25 UTC40m
2026-07-19 DAL932 JFK → ATL Jul 19, 19:37 UTCJul 19, 20:14 UTC37m
2026-07-19 DAL932 JFK → ATL Jul 19, 19:40 UTCJul 19, 20:15 UTC35m
2026-07-19 DAL3054 CHS → ATL Jul 19, 13:50 UTCJul 19, 14:35 UTC45m
2026-07-19 DAL2453 LGA → DTW Jul 19, 10:20 UTCJul 19, 11:50 UTC1h 30m
2026-07-18 DAL2058 GRR → ATL Jul 18, 19:30 UTCJul 18, 21:05 UTC1h 35m
2026-07-18 DAL2013 CUN → ATL Jul 18, 15:05 UTCJul 18, 17:20 UTC2h 15m
2026-07-18 DAL2014 SDF → ATL Jul 18, 11:35 UTCJul 18, 12:45 UTC1h 10m
2026-07-18 DAL2014 SDF → ATL Jul 18, 11:31 UTCJul 18, 13:38 UTC2h 7m
2026-07-18 DAL1097 - Jul 18, 03:05 UTCJul 18, 03:55 UTC50m
2026-07-18 DAL1097 ATL → RDU Jul 18, 01:05 UTCJul 18, 02:00 UTC55m
2026-07-17 DAL1273 - Jul 17, 22:49 UTCJul 17, 23:25 UTC35m
2026-07-17 DAL1273 GSP → ATL Jul 17, 22:45 UTCJul 17, 23:19 UTC34m
2026-07-17 DAL1273 - Jul 17, 17:20 UTCJul 17, 17:50 UTC30m
2026-07-17 DAL1273 ATL → GSP Jul 17, 17:17 UTCJul 17, 17:48 UTC31m
2026-07-17 DAL1500 - Jul 17, 14:24 UTCJul 17, 15:40 UTC1h 15m
2026-07-17 DAL1500 ATL → CLE Jul 17, 11:39 UTCJul 17, 12:55 UTC1h 15m
2026-07-17 DAL719 BNA → ATL Jul 17, 01:20 UTCJul 17, 01:59 UTC40m
2026-07-16 DAL719 ATL → BNA Jul 16, 22:45 UTCJul 16, 23:25 UTC40m

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 N891DN page for operator, model, and routing details .

Mode-S AC4963 frequently asked

What is Mode-S code AC4963?
AC4963 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N891DN.
Where is Mode-S AC4963 registered?
Mode-S code AC4963 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 AC4963 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 AC4963, octal 53044543, decimal 11,290,979.
What flights does AC4963 operate?
Mode-S AC4963 has broadcast 20 distinct callsigns, including DAL1913, DAL2042, DAL1542, DAL2500, DAL1730.