PKT
application/octet-stream
Magic Bytes
Offset: 0
78 56 34
The PKT file format is a proprietary data structure developed and maintained by Cisco Systems for use within the Packet Tracer network simulation software. It serves as a container for network topologies, device configurations, and instructional lab exercises utilized by students and educators in computer networking programs. Although inherently safe because it contains simulation data rather than compiled code, it remains a proprietary format intended for use only within authorized Cisco simulation environments.
Validation Code
How to validate .pkt files in Python
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
Node.js
function isPKT(buffer: Buffer): boolean {
const signature = Buffer.from([0x78, 0x56, 0x34]);
return buffer.subarray(0, 3).equals(signature);
}
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
GET
/api/v1/pkt
curl https://filesignature.org/api/v1/pkt