`fc.symcb.com`

	CNAME	`crl-symcprod.digicert.com`
	DNSSEC	⚠️ Not signed

symcb.com

symcb.com is a certificate infrastructure domain operated by DigiCert (formerly Symantec PKI). The domain serves as an endpoint for SSL/TLS certificate validation services, including OCSP (Online Certificate Status Protocol) and CRL (Certificate Revocation List) distribution.

Purpose

The domain hosts certificate validation infrastructure:

OCSP responders at subdomains like d.symcb.com and te.symcb.com
Used by browsers and applications to verify certificate validity in real-time
Part of the legacy Symantec Certificate Authority infrastructure now managed by DigiCert

History

Originally operated by Symantec Corporation as part of their PKI/certificate authority business
In 2017, DigiCert acquired Symantec's Website Security and PKI solutions
The symcb.com domain continues to operate for backward compatibility with certificates issued under the Symantec brand

Technical Details

Nameservers: Split between UltraDNS (pdns196) and DigiCert DNS (ns20-ns25.digicertdns.com)
SPF: v=spf1 -all (no mail accepted - infrastructure-only domain)
DNSSEC: Not enabled
Tranco Rank: #2,781 (high traffic due to certificate validation requests)

The high Tranco ranking reflects the domain's heavy use by browsers worldwide for certificate status checks.

Same first word

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🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
symcb.com	pdns196.ultradns.com, pdns196.ultradns.net, pdns196.ultradns.org, pdns196.ultradns.biz...	-

✅ Authoritative Response

Server: 156.154.64.196

NS records: pdns196.ultradns.com, pdns196.ultradns.net, pdns196.ultradns.org, pdns196.ultradns.biz, ns20.digicertdns.com, ns21.digicertdns.com, ns22.digicertdns.com, ns24.digicertdns.net, ns25.digicertdns.net, ns23.digicertdns.net

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for symcb.com (unsigned zone)

⏱️ Timing

Total: 55ms | Queries: -

📄 Records

Type	Count	Sample Data
CNAME	1	`crl-symcprod.digicert.com`

fc.symcb.com - robtex.com