Lotus Notes database (.nsf)
.nsf file signature | application/vnd.lotus-notes
Lotus Notes Database (NSF) is a database file format originally created by Lotus Development Corporation and later maintained by IBM and HCL Technologies as part of the Notes and Domino platform. It is used to store email, calendars, applications, documents, and other collaborative data in enterprise environments. The format is associated with legacy groupware systems, and files from untrusted sources may require careful handling when opened or converted.
Magic Bytes
Offset 0
1A 00 00 04 00 00
Sources: Gary Kessler
All Known Signatures
2 signature variants are documented for .nsf files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| 1A 00 00 04 00 00 | 0 | Gary Kessler |
| 4E 45 53 4D 1A 01 | 0 | Gary Kessler |
Extension
.nsf
MIME Type
application/vnd.lotus-notes
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .nsf files in Python
def is_nsf(file_path: str) -> bool:
"""Check if file is a valid NSF by magic bytes."""
signature = bytes([0x1A, 0x00, 0x00, 0x04, 0x00, 0x00])
with open(file_path, "rb") as f:
return f.read(6) == signatureHow to validate .nsf files in Node.js
function isNSF(buffer: Buffer): boolean {
const signature = Buffer.from([0x1A, 0x00, 0x00, 0x04, 0x00, 0x00]);
return buffer.subarray(0, 6).equals(signature);
}How to validate .nsf files in Go
func IsNSF(data []byte) bool {
signature := []byte{0x1A, 0x00, 0x00, 0x04, 0x00, 0x00}
if len(data) < 6 {
return false
}
return bytes.Equal(data[:6], signature)
}API Endpoint
/api/v1/nsf
curl https://filesignature.org/api/v1/nsf
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .nsf file?
A .nsf file is a Lotus Notes database file. Lotus Notes Database (NSF) is a database file format originally created by Lotus Development Corporation and later maintained by IBM and HCL Technologies as part of the Notes and Domino platform. It is used to store email, calendars, applications, documents, and other collaborative data in enterprise environments. The format is associated with legacy groupware systems, and files from untrusted sources may require careful handling when opened or converted.
What are the magic bytes for .nsf files?
The magic bytes for Lotus Notes database files are 1A 00 00 04 00 00 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .nsf file?
To validate a .nsf file, read the first bytes of the file and compare them against the known magic bytes (1A 00 00 04 00 00) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .nsf files?
The primary MIME type for .nsf files is application/vnd.lotus-notes.
Is it safe to open .nsf files?
Lotus Notes database (.nsf) 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.