ai domain available check (alab -> zlab)

check.py

#!/usr/bin/env python3
"""
Check alab.ai … zlab.ai using RDAP (https over 443, no WHOIS needed)
"""
import string, time, requests

RDAP = "https://rdap.identitydigital.services/rdap/domain/{}"

def is_available(domain: str) -> bool | None:
    r = requests.get(RDAP.format(domain), timeout=10)
    if r.status_code == 404:      # RDAP: 404 means “domain not found”
        return True
    if r.status_code == 200:
        return False
    if r.status_code == 429:      # too many queries – back off
        time.sleep(2)
        return is_available(domain)
    return None                   # network / server error

for ch in string.ascii_lowercase:
    d = f"{ch}lab.ai"
    status = is_available(d)
    label = {True: "AVAILABLE", False: "REGISTERED"}.get(status, "UNKNOWN")
    print(f"{d:10s} {label}")
    time.sleep(0.2)               # 5 req/s ≈ registry’s comfort zone