Why might a oui.txt file have appeared in my home directory on my MBP?

oui.txt has "suddenly" appeared. I don't know how/why.

It's 4.1MB, so it's probably this: https://linuxnet.ca/ieee/oui/

Sanitized oui.txt Wed, 12 Feb 2020 03:10:16 -0400 • 4.1 MB (4,050,564 bytes) • ASCII

The result of ls -le@ oui.txtis:

$: ls -le@ oui.txt
-rw-r--r--@ 1 user staff 4047610 31 Jan 12:20 oui.txt
        com.apple.TextEncoding 15

I have a file on my computer named utils6.py. The top of the file has this comment section.

This file is part of Scapy See http://www.secdev.org/projects/scapy for more informations Copyright (C) Philippe Biondi This program is published under a GPLv2 license

Copyright (C) 2005 Guillaume Valadon
Arnaud Ebalard

The code has Utility functions for IPv6.

This utility script outputs a file called oui.txt