to.symcd.com - robtex.com

to.symcd.com

CNAMEmpki-ocsp.digicert.com
DNSSEC⚠️ Not signed

symcd.com

DNSSEC⚠️ Not signed
NSns20.digicertdns.com ⭐
NSns21.digicertdns.com
NSns22.digicertdns.com
NSns23.digicertdns.net
NSns24.digicertdns.net
NSns25.digicertdns.net
NSpdns196.ultradns.biz
NSpdns196.ultradns.com
NSpdns196.ultradns.net
NSpdns196.ultradns.org
SOAns20.digicertdns.comdns@digicertdns.com 2009-01-02 #76
📈 Tranco rank: #3,880

DigiCert PKI Infrastructure Domain

symcd.com is a critical Public Key Infrastructure (PKI) domain operated by DigiCert, one of the world's largest Certificate Authorities. The domain name derives from "Symantec Certificate Distribution" — a legacy from Symantec's Website Security business, which DigiCert acquired in 2017.

Purpose

This domain serves as infrastructure for SSL/TLS certificate validation services:

  • OCSP Responders — Online Certificate Status Protocol endpoints (e.g., s.symcd.com) that allow browsers to verify if a certificate has been revoked in real-time
  • CRL Distribution — Certificate Revocation List hosting for certificates that need offline revocation checking
  • Certificate Chains — Intermediate certificate distribution for trust chain validation

The domain's high traffic rank (Tranco #3,681) reflects its role in billions of daily certificate validation requests from web browsers worldwide.

DNS Infrastructure

  • Authoritative Nameservers: Redundant configuration using both UltraDNS (pdns196.ultradns.) and DigiCert's own DNS infrastructure (ns20-25.digicertdns.)
  • Primary Contact: dns@digicertdns.com
  • Subdomains: 52+ including s.symcd.com (OCSP), g.symcd.com, tc.symcd.com
  • DNSSEC: Not enabled
  • IPv4/IPv6: Dual-stack support on all nameservers

Technical Notes

The domain itself does not host a website — it exists purely for PKI operations. Subdomains like s.symcd.com resolve to DigiCert's OCSP infrastructure (pki-ocsp.digicert.com), handling certificate status queries for millions of Symantec-legacy and DigiCert-issued certificates still in use across the internet.

Same first word

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to.s3-website-ap-northeast-1.amazonaws.com
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Similar names

ot.by
ot.am
ot.pl
ot.gr
ot.no
ot.cz
ot.fi
ot.govt.nz
ot.hr
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ot.lv
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ot.org.cn
ot.dk
ot.ca
ot.ua
ot.su
ot.net.ua
ot.be
ot.net.au
ot.nl
ot.co
ot.lt

DNS History

6 records (1 active, 5 former)

2017201820192020202120222023202420252026A23.43.75.272a02:26f0:a1:28c::201a2a02:26f0:a1:298::201aCNAMEmpki-ocsp.digicert.come8218.dscb1.akamaiedge.netocsp-ds.ws.symantec.com.edgekey.net
○A23.43.75.272016-12-28 → 2016-12-28 · 3 obs
● 2016-12-28 19:53:16
○ 2020-05-26 11:39:22
○ 2026-03-15 20:18:40
○A2a02:26f0:a1:28c::201a2016-12-28 → 2016-12-28 · 3 obs
● 2016-12-28 19:53:16
○ 2020-05-26 11:39:22
○ 2026-03-15 20:18:40
○A2a02:26f0:a1:298::201a2016-12-28 → 2016-12-28 · 3 obs
● 2016-12-28 19:53:16
○ 2020-05-26 11:39:22
○ 2026-03-15 20:18:40
○CNAMEe8218.dscb1.akamaiedge.net2016-12-28 → 2016-12-28 · 3 obs
● 2016-12-28 19:53:16
○ 2020-05-26 11:39:22
○ 2026-03-15 20:18:40
●CNAMEmpki-ocsp.digicert.com2026-03-15 → 2026-03-15 · 3 obs
○ 2020-05-26 11:39:22
● 2026-03-15 20:18:38
● 2026-03-15 20:18:40
○CNAMEocsp-ds.ws.symantec.com.edgekey.net2016-12-28 → 2020-05-26 · 4 obs
● 2016-12-28 19:53:16
● 2020-05-26 11:39:22
○ 2026-03-15 20:18:38
○ 2026-03-15 20:18:40

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coma.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...-
symcd.compdns196.ultradns.com, pdns196.ultradns.net, pdns196.ultradns.org, pdns196.ultradns.biz...8 records

✅ Authoritative Response

Server: 156.154.67.196

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 symcd.com (unsigned zone)

⏱️ Timing

Total: 974ms | Queries: -

📄 Records

TypeCountSample Data
CNAME1mpki-ocsp.digicert.com

📌 Glue Records Collected

Total: 8

Out-of-bailiwick: 8 (pdns196.ultradns.com, pdns196.ultradns.com, ns20.digicertdns.com...)