PKT (.pkt)
.pkt file signature | application/octet-stream
PKT is a file format used by Cisco Packet Tracer, the network simulation software developed and maintained by Cisco Systems. It stores saved network topologies, device configurations, and lab exercises for training, coursework, and certification practice. The format is generally safe, though it may contain embedded activities or references to external resources, so files from untrusted sources should be opened with care.
Magic Bytes
Offset 0
78 56 34
Sources: Wikipedia
Extension
.pkt
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .pkt files in Python
def is_pkt(file_path: str) -> bool:
"""Check if file is a valid PKT by magic bytes."""
signature = bytes([0x78, 0x56, 0x34])
with open(file_path, "rb") as f:
return f.read(3) == signatureHow to validate .pkt files in Node.js
function isPKT(buffer: Buffer): boolean {
const signature = Buffer.from([0x78, 0x56, 0x34]);
return buffer.subarray(0, 3).equals(signature);
}How to validate .pkt files in Go
func IsPKT(data []byte) bool {
signature := []byte{0x78, 0x56, 0x34}
if len(data) < 3 {
return false
}
return bytes.Equal(data[:3], signature)
}API Endpoint
/api/v1/pkt
curl https://filesignature.org/api/v1/pkt
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .pkt file?
A .pkt file is identified by the magic bytes 78 56 34 at byte offset 0. PKT is a file format used by Cisco Packet Tracer, the network simulation software developed and maintained by Cisco Systems. It stores saved network topologies, device configurations, and lab exercises for training, coursework, and certification practice. The format is generally safe, though it may contain embedded activities or references to external resources, so files from untrusted sources should be opened with care.
What are the magic bytes for .pkt files?
The magic bytes for PKT files are 78 56 34 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .pkt file?
To validate a .pkt file, read the first bytes of the file and compare them against the known magic bytes (78 56 34) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .pkt files?
There is no officially registered MIME type for .pkt files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .pkt files?
PKT (.pkt) files are generally safe to open. They are classified as low risk because they primarily contain data rather than executable code. However, always ensure files come from a trusted source.