ASCII code for synchronous idle
22
Synchronous Idle — a control character, not printable
| Decimal | 22 |
| Hexadecimal | 0x16 |
| Octal | 0026 |
| Binary | 00010110 |
| HTML entity |  |
What it is
Sent to keep a synchronous link in step when there was no data to send. The name survives in the TCP SYN packet.
The full entry
ASCII 22 in full — the code point page, with what sits either side of it and how the character is encoded elsewhere.
Frequently asked questions
What is the ASCII code for synchronous idle?
The ASCII code for synchronous idle is 22 in decimal, 0x16 in hexadecimal and 0026 in octal.
What is synchronous idle in binary?
00010110 — eight bits, though ASCII only defines seven, so the top bit is always zero.
Is synchronous idle a printable character?
No. Synchronous Idle is a control character — an instruction to a teleprinter rather than a mark on paper, which is why most tables show an empty cell for it.
Other characters
- ASCII code for end of transmission block — 23
- ASCII code for cancel — 24
- ASCII code for end of medium — 25
- ASCII code for substitute — 26
- ASCII code for escape — 27
- ASCII code for file separator — 28
- ASCII code for group separator — 29
- ASCII code for record separator — 30
- ASCII code for unit separator — 31
- ASCII code for space — 32
- ASCII code for exclamation mark — 33
- ASCII code for double quote — 34
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