sd.symcd.com - robtex.com

sd.symcd.com

CNAMEmpki-ocsp.digicert.com
DNSSECโš ๏ธ Not signed

symcd.com

WOT: SAFE (50/100)
๐Ÿ“ˆ 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" โ€” 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 โ€” 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 โ€” Certificate Revocation List hosting for certificates that need offline revocation checking
  • Certificate Chains โ€” 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 โ€” 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

Similar names

DNS History

48 records (1 active, 47 former)

20162017201820192020202120222023202420252026A2.22.139.272001:418:1420:182::201a2001:418:1420:18b::201a2001:418:143c:180::201a2001:418:143c:18b::201a2001:4de0:2103:18c::201a2001:4de0:2103:190::201a2001:4de0:4103:180::201a2001:4de0:4103:181::201a2001:5000:1101:187::201a2001:5000:1101:188::201a2001:559:19:83::201a2001:559:19:a0::201a2001:590:1009:186::201a2001:590:1009:18d::201a2001:590:100b:185::201a2001:590:100b:187::201a2001:590:100b:18f::201a2001:590:100b:19c::201a23.4.187.2723.43.11.2723.44.155.2723.47.27.2723.49.139.2723.5.251.2723.50.75.2723.50.91.2723.52.91.2723.53.155.2723.54.139.2723.59.139.2723.7.139.272600:1406:13:285::201a2600:1406:13:291::201a2600:1408:10:183::201a2600:1408:10:191::201a2600:1408:e:480::201a2600:1408:e:490::201a2a02:26f0:105:182::201a2a02:26f0:105:18d::201a2a02:26f0:105:18e::201a2a02:26f0:a1:28c::201a2a02:26f0:a1:298::201aCNAMEmpki-ocsp.digicert.come8218.ce.akamaiedge.nete8218.dscb1.akamaiedge.netocsp-ds.ws.symantec.com.edgekey.netocsp.ws.symantec.com.edgekey.net
โ—‹A2.22.139.272015-09-03 โ†’ 2016-10-16 ยท 28 obs
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โ—‹A2001:5000:1101:187::201a2017-01-28 โ†’ 2017-01-28 ยท 4 obs
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โ—‹A2001:5000:1101:188::201a2017-01-28 โ†’ 2017-01-28 ยท 4 obs
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โ—‹A2001:559:19:83::201a2015-12-07 โ†’ 2015-12-07 ยท 4 obs
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โ—‹A2001:590:1009:186::201a2016-01-16 โ†’ 2016-01-30 ยท 7 obs
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โ—‹A2001:590:100b:185::201a2015-12-31 โ†’ 2016-01-21 ยท 8 obs
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โ—‹A2001:590:100b:187::201a2015-12-31 โ†’ 2016-01-21 ยท 8 obs
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โ—‹A2001:590:100b:18f::201a2016-10-05 โ†’ 2016-10-05 ยท 4 obs
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โ—‹A23.4.187.272015-09-12 โ†’ 2017-01-24 ยท 27 obs
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โ—‹A23.43.11.272015-09-03 โ†’ 2015-09-03 ยท 3 obs
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โ—‹A23.44.155.272015-09-18 โ†’ 2015-10-02 ยท 5 obs
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โ—‹A23.47.27.272015-09-18 โ†’ 2015-10-29 ยท 7 obs
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โ—‹A23.49.139.272015-09-03 โ†’ 2015-10-02 ยท 7 obs
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โ—‹A23.5.251.272015-09-03 โ†’ 2016-06-01 ยท 9 obs
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โ—‹A23.50.75.272015-09-03 โ†’ 2015-09-26 ยท 6 obs
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โ—‹A23.50.91.272015-09-03 โ†’ 2015-10-02 ยท 4 obs
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โ—‹A23.52.91.272015-09-03 โ†’ 2016-12-20 ยท 30 obs
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โ—‹A23.53.155.272015-09-03 โ†’ 2015-10-02 ยท 4 obs
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โ—‹A23.54.139.272015-09-26 โ†’ 2017-01-28 ยท 6 obs
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โ—‹A23.59.139.272015-09-07 โ†’ 2015-09-12 ยท 5 obs
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โ—‹A23.7.139.272016-04-27 โ†’ 2016-05-25 ยท 6 obs
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โ—‹A2600:1406:13:285::201a2016-05-10 โ†’ 2016-06-01 ยท 5 obs
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โ—‹A2600:1406:13:291::201a2016-05-10 โ†’ 2016-06-01 ยท 5 obs
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โ—‹A2600:1408:10:183::201a2016-02-07 โ†’ 2017-01-24 ยท 17 obs
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โ—‹A2600:1408:10:191::201a2016-02-07 โ†’ 2017-01-24 ยท 17 obs
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โ—‹A2600:1408:e:480::201a2016-03-08 โ†’ 2016-03-08 ยท 4 obs
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โ—‹A2600:1408:e:490::201a2016-03-08 โ†’ 2016-03-08 ยท 4 obs
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โ—‹A2a02:26f0:105:182::201a2016-01-06 โ†’ 2016-01-06 ยท 4 obs
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โ—‹A2a02:26f0:105:18d::201a2016-01-06 โ†’ 2016-04-20 ยท 10 obs
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โ—‹A2a02:26f0:105:18e::201a2016-01-24 โ†’ 2016-04-20 ยท 7 obs
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โ—‹A2a02:26f0:a1:28c::201a2016-08-25 โ†’ 2016-10-16 ยท 7 obs
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โ—‹A2a02:26f0:a1:298::201a2016-08-25 โ†’ 2016-10-16 ยท 7 obs
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โ—‹CNAMEe8218.ce.akamaiedge.net2015-09-07 โ†’ 2015-11-07 ยท 5 obs
โ—‹ 2015-09-03 02:22:10
โ— 2015-09-07 21:55:54
โ— 2015-11-07 10:33:24
โ—‹ 2015-11-11 06:31:44
โ—‹ 2026-03-13 20:01:00
โ—‹CNAMEe8218.dscb1.akamaiedge.net2015-11-11 โ†’ 2017-01-28 ยท 5 obs
โ—‹ 2015-11-07 10:33:24
โ— 2015-11-11 06:31:44
โ— 2017-01-28 02:19:44
โ—‹ 2021-05-17 18:01:06
โ—‹ 2026-03-13 20:01:00
โ—CNAMEmpki-ocsp.digicert.com2026-03-12 โ†’ 2026-03-13 ยท 3 obs
โ—‹ 2021-05-17 18:01:06
โ— 2026-03-12 07:41:02
โ— 2026-03-13 20:01:00
โ—‹CNAMEocsp-ds.ws.symantec.com.edgekey.net2015-11-11 โ†’ 2021-05-17 ยท 5 obs
โ—‹ 2015-11-07 10:33:24
โ— 2015-11-11 06:31:44
โ— 2021-05-17 18:01:06
โ—‹ 2026-03-12 07:41:02
โ—‹ 2026-03-13 20:01:00
โ—‹CNAMEocsp.ws.symantec.com.edgekey.net2015-09-03 โ†’ 2015-11-07 ยท 4 obs
โ— 2015-09-03 02:22:10
โ— 2015-11-07 10:33:24
โ—‹ 2015-11-11 06:31:44
โ—‹ 2026-03-13 20:01:00

๐Ÿ” DNS Trace

๐Ÿ“‹ Delegation Chain

ZoneNameserversGlue
come.gtld-servers.net, h.gtld-servers.net, k.gtld-servers.net, b.gtld-servers.net...26 records
symcd.compdns196.ultradns.com, pdns196.ultradns.net, pdns196.ultradns.org, pdns196.ultradns.biz...8 records

โœ… 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

๐Ÿ”’ DNSSEC Status

โš ๏ธ Insecure (no DNSSEC)

No DS record for symcd.com (unsigned zone)

โฑ๏ธ Timing

Total: 716ms | Queries: -

๐Ÿ“„ Records

TypeCountSample Data
CNAME1mpki-ocsp.digicert.com

๐Ÿ“Œ Glue Records Collected

Total: 34

Out-of-bailiwick: 34 (m.gtld-servers.net, l.gtld-servers.net, k.gtld-servers.net...)