10 codes are used in CB Radio transmitting to quickly relay information. The most commonly known ones are "10-4", meaning OK, and "What's your 20?" meaning "Where are you?" You can hear some of these codes in the song Convoy.

My favorite is 10-100.

10 codes may vary by location in the U.S. or world - there are regional dialects. Most of the countries that know them are English-speaking. Q codes are more internationally known, for CB, ham radio, and other amateur radio enthusiasts.

  • 10-0 - Caution
  • 10-1 - Weak signal
  • 10-2 - Good signal
  • 10-3 - Stop transmitting
  • 10-4 - Affirmative, OK
  • 10-5 - Relay message to .....
  • 10-6 - Busy
  • 10-7 - Out of service
  • 10-8 - In service
  • 10-9 - Repeat transmission
  • 10-10 - Transmission complete, standing by
  • 10-11 - Talking too fast
  • 10-12 - Stand by, visitors present
  • 10-13 - Advise of existing conditions
  • 10-14 - Message, information
  • 10-15 - Message delivered
  • 10-16 - Reply to message
  • 10-17 - Enroute
  • 10-18 - Urgent
  • 10-19 - Contact, in contact with
  • 10-20 - Location
  • 10-21 - Contact ______ by phone
  • 10-22 - Disregard
  • 10-23 - Arrived at scene
  • 10-24 - Assignment completed
  • 10-25 - Report to, meet
  • 10-26 - Estimated arrival time
  • 10-26- Disregard Last Information/Cancel Last Message/Ignore
  • 10-27- I am moving to Channel ......
  • 10-28- Identify your station
  • 10-29- Time is up for contact
  • 10-30- Does not conform to FCC Rules
  • 10-32- I will give you a radio check
  • 10-33- Emergency Traffic at this station
  • 10-34- Trouble at this station, help needed
  • 10-35- Confidential Information
  • 10-36- Correct Time is .........
  • 10-38- Ambulance needed at .........
  • 10-39- Your message delivered
  • 10-41- Please tune to channel ........
  • 10-42- Traffic Accident at ..........
  • 10-43- Traffic tieup at .........
  • 10-44- I have a message for you (or .........)
  • 10-45- All units within range please report
  • 10-50- Break Channel
  • 10-62- Unable to copy, use phone
  • 10-65- Awaiting your next message/assignment
  • 10-67- All units comply
  • 10-70- Fire at .......
  • 10-73- Speed Trap at ............
  • 10-75 -You are causing interference
  • 10-77 -Negative Contact
  • 10-84 -My telephone number is .........
  • 10-85 -My address is ...........
  • 10-91 -Talk closer to the mike
  • 10-92 -Your transmitter is out of adjustment
  • 10-93 -Check my frequency on this channel
  • 10-94 -Please give me a long count
  • 10-95 -Transmit dead carrier for 5 sec.
  • 10-99 -Mission completed, all units secure
  • 10-100 - Need to go to bathroom
  • 10-200 - Police needed at ..........
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