`mail.api-bt.cn`

DNSSEC	⚠️ Not signed
A	5.104.81.193^{🇩🇰 CONTABO-ASIA5.104.80.0/22 CONTABO}
		PTR	`vmi1317454.contaboserver.net`

`api-bt.cn`

DNSSEC	⚠️ Not signed
A	2606:4700:3035::6815:186d^{🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3036::ac43:da57^{🇺🇸 Cloudflare2606:4700:3036::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.24.109^{Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.218.87^{🇺🇸 Cloudflare172.67.208.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`donna.ns.cloudflare.com` ⭐
NS	`sid.ns.cloudflare.com`
MX	`mail.api-bt.cn` ⭐
TXT	`v=spf1 a mx ~all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.24.109, 172.67.218.87
		IPv6 hints	2606:4700:3035::6815:186d, 2606:4700:3036::ac43:da57
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=227, name=cloudflare-ech.com
SOA	`donna.ns.cloudflare.com`dns@cloudflare.com serial=2410762350

MX for

api-bt.cn

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DNS History

1 record (1 active, 0 former)

●A5.104.81.1932026-07-04 → 2026-07-29 · 2 obs

● 2026-07-04 12:45:18
● 2026-07-29 13:21:24

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cn	a.dns.cn, b.dns.cn, e.dns.cn, d.dns.cn...	-
api-bt.cn	sid.ns.cloudflare.com, donna.ns.cloudflare.com	-

✅ Authoritative Response

Server:172.64.33.143

NS records: sid.ns.cloudflare.com, donna.ns.cloudflare.com

🔒 DNSSEC Status

❌ Bogus (DNSSEC validation failed)

Validation error at cn: Error: DNS query timeout: 203.119.25.1 for DNSKEY cn

⏱️ Timing

Total: 3643ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`5.104.81.193`

Analysis

Mail Server Role

The mail server mail.api-bt.cn processes email for api-bt.cn.

IP Addresses

mail.api-bt.cn resolves to just one IP address, 5.104.81.193.

Host names like dulun1918.com are further examples that share IP numbers with mail.api-bt.cn.

mail.api-bt.cn - robtex.com

mail.api-bt.cn

api-bt.cn