Skip to content
Gridlode
Rank #915Updated November 10, 2026

isc.org

ISC - ISC

isc.org is registered with Tucows Domains Inc. since April 4, 1994 (32.6 years). The registration expires on April 5, 2028. The site runs on Varnish, cdnjs, Fastly and 9 other technologies. Its email security grade is A. Its SSL certificate is issued by GlobalSign nv-sa and is valid for 182 more days.

Domain age
32.6 yrs
Technologies
12
Email security
A
SSL days left
182

Registration

RegistrarTucows Domains Inc.
IANA ID69
RegisteredApril 4, 1994
ExpiresApril 5, 2028
UpdatedAugust 12, 2026
Statusclient transfer prohibited, client update prohibited
Name serversns.isc.afilias-nst.info, ns1.isc.org, ns2.isc.org, ns3.isc.org, nsp.dnsnode.net
DNSSECSigned

DNS records

TypeValueTTL
A151.101.3.42300
A151.101.67.42300
A151.101.131.42300
A151.101.195.42300
MXmx.pao1.isc.org 5300
MXmx.ams1.isc.org 10300
NSns.isc.afilias-nst.info7200
NSns1.isc.org7200
NSns2.isc.org7200
NSns3.isc.org7200
NSnsp.dnsnode.net7200
CAAiodef 0 mailto:[email protected]7200
CAAissue 0 Digicert.com7200
CAAissue 0 certainly.com7200
CAAissue 0 comodoca.com7200
CAAissue 0 globalsign.com7200
CAAissue 0 letsencrypt.org7200
CAAissue 0 pki.goog7200
CAAissue 0 sectigo.com7200
CAAissuewild 0 certainly.com7200
CAAissuewild 0 comodoca.com7200
CAAissuewild 0 globalsign.com7200
CAAissuewild 0 sectigo.com7200
TXTF8C4EB90117200
TXTMS=2583E0E0DCCBF33EC6DAFF0B4BFBAF78FFCF7AD07200
TXTgoogle-site-verification=6v652rgkk_kI6Ky32iGdxqXjQ4_BAd5DYKsrnRXKUiE7200
TXTgoogle-site-verification=grXE1SbXWNed6C5yQgI8fwxgucE0DppnbICbhZr9qG07200
TXTgoogle-site-verification=wg4m8dWi3XVPRYmtBoy6xSKp3juhxIWa6UdxjZkNQCg7200
TXT_globalsign-domain-verification=ckxXdoIq27XGYE4ATbBYQOBeV7PTJWRxYe-PXDyzMX7200
TXTv=spf1 a mx ip4:149.20.0.0/20 ip6:2001:04F8::0/32 ip6:2001:500:60::65/128 ip4:199.6.1.0/24 ip6:2001:500:6b:2::0/64 include:shops.shopify.com include:servers.mcsv.net include:_spf.salesforce.com include:spf-a.customercenter.net include:spf-b.customercenter.net include:spf-c.customercenter.net ~all7200
AAAA2a04:4e42::810300
AAAA2a04:4e42:200::810300
AAAA2a04:4e42:400::810300
AAAA2a04:4e42:600::810300

Technology stack

Cache
Varnish
CDN
cdnjsFastlyGoogle Hosted LibrariesjsDelivr
JavaScript library
jQueryPopper
Security
Content Security PolicyHSTS
Static site generator
Hugo
UI framework
Bootstrap
Web server
Apache HTTP Server

SSL certificate

ValidValid
IssuerBE, GlobalSign Atlas R46 DV TLS CA 2026 Q4, GlobalSign nv-sa
ExpiresMay 11, 2027
Days remaining182
ProtocolTLSv1.3
Names*.isc.org, isc.org, f.root-servers.org

Email security

AScore 93/100 across SPF, DMARC, DKIM, MTA-STS and BIMI.
  • warnSPF uses 9 of the 10 allowed DNS lookups. Adding another service may break it.
  • warnMTA-STS is in testing mode. Switch to mode: enforce once reports look clean.
  • warnNo BIMI record (optional: shows your logo next to your emails in supporting inboxes).
  • goodSPF record found.
  • goodSPF ends with ~all: servers you have not listed are marked as suspicious (soft fail).
  • goodDMARC policy is reject: mail that fails authentication is blocked.
  • goodDMARC aggregate reports are sent to mailto:[email protected], mailto:[email protected].
  • goodDKIM keys found (selector: k2).
  • good2 MX record(s) found.
  • goodTLS-RPT is set up: you receive reports about failed encrypted deliveries.

Homepage metadata

TitleISC - ISC
DescriptionOpen source software information, blogs, events, downloads and support
Languageen-us
Canonicalhttps://www.isc.org/
IndexableYes
Word count755

About isc.org

Who is the registrar of isc.org?

isc.org is registered with Tucows Domains Inc. (IANA ID 69).

When does isc.org expire?

The current registration of isc.org expires on April 5, 2028. It was first registered on April 4, 1994.

What technology does isc.org use?

We detected 12 technologies on isc.org, including Varnish, cdnjs, Fastly, Google Hosted Libraries, jsDelivr, jQuery.

Does isc.org protect its email with SPF and DMARC?

isc.org scores 93/100 (grade A) for email security. SPF uses 9 of the 10 allowed DNS lookups. Adding another service may break it. MTA-STS is in testing mode. Switch to mode: enforce once reports look clean.

What are the name servers of isc.org?

isc.org uses ns.isc.afilias-nst.info, ns1.isc.org, ns2.isc.org, ns3.isc.org, nsp.dnsnode.net.