ASCII 21: Negative Acknowledge
CHARACTER
NAK
Negative Acknowledge
Control Character · Non-printable · ASCII 21
All Representations
| Format | Value |
|---|---|
| Decimal | 21 |
| Binary | 00010101 |
| Hexadecimal | 0x15 |
| Octal | 25 |
| HTML Entity |  |
| CSS Escape | \15 |
| JS Escape | \x15 |
| Python Escape | \x15 |
Character Information
| Property | Value |
|---|---|
| Category | Control Character |
| Printable | No |
| Control character | Yes |
| Range | Standard ASCII (0–127) |
Nearby ASCII Codes
Frequently Asked Questions
- What character is ASCII code 21?
ASCII code 21 is the Negative Acknowledge. It is a control character.
- What is ASCII 21 in binary?
ASCII 21 in binary is 00010101. In hexadecimal it is 0x15.
- Is ASCII 21 a printable character?
No, ASCII 21 is a control character (Negative Acknowledge) and is not printable.