#!/usr/bin/env python

import subprocess

r = subprocess.run("net 4e:4f:50", shell=True, capture_output=True)

macs = []
lines = r.stdout.split(b"\n")
for line in lines:
    if b"4E:4F:50" in line:
        _, data = line.split(b"4E:4F:50")
        suffix = data.split(b" ")[0]
        macs.append(f"4E:4F:50{str(suffix, 'utf-8')}")

for line in sorted(macs):
    print(line)

Improved version sorts by MAC address, but shows all net fields.

#!/usr/bin/env python

import subprocess

r = subprocess.run("net 4e:4f:50", shell=True, capture_output=True)

macs = {}
lines = r.stdout.split(b"\n")
for n, line in enumerate(lines):
    line = str(line, "utf-8")
    if n < 2:
        print(line)
    if "4E:4F:50" in line:
        _, data = line.split("4E:4F:50")
        suffix = data.split(" ")[0]
        mac = f"4E:4F:50{suffix}"
        entry = macs.get(mac, [])
        entry.append(line)
        macs[mac] = entry

for mac in sorted(macs.keys()):
    lines = macs[mac]
    for line in lines:
            print(line)