要查询一个域名的子域名数量,通常涉及以下几个基础概念和技术:
mail.example.com
是example.com
的一个子域名。dig
、nslookup
)手动查询子域名。Sublist3r
、Amass
。dnspython
库查询子域名)import dns.resolver
def query_subdomains(domain):
subdomains = set()
try:
answers = dns.resolver.resolve(domain, 'CNAME')
for rdata in answers:
subdomains.add(str(rdata))
except dns.resolver.NXDOMAIN:
print(f"{domain} does not exist.")
except dns.resolver.NoAnswer:
print(f"{domain} has no CNAME records.")
except dns.resolver.Timeout:
print(f"Query timed out for {domain}.")
return subdomains
domain = 'example.com'
subdomains = query_subdomains(domain)
print(f"Subdomains of {domain}:")
for subdomain in subdomains:
print(subdomain)
通过上述方法和工具,可以有效地查询和管理域名的子域名。
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