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93
Total
100
DNS
95
Email
88
Security
70
Network
100
Availability
Domainisc.org
IPv44
IPv64
MX records2
StatusActive
Domain technical report

ISC - ISC

isc.org

Open source software information, blogs, events, downloads and support

Generated: 2026-08-08T19:47:58-05:00 · Cached result

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IPv44
IPv64
MX2
NS5

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

4 IPv4 address(es) detected.

✓
IPv6 (AAAA)10 / 10 pts · Dns

4 IPv6 address(es) detected.

✓
Name server redundancy20 / 20 pts · Dns

5 NS record(s); 2 or more required.

✓
SOA record10 / 10 pts · Dns

Authoritative zone record.

✓
DNSSEC chain15 / 15 pts · Dns

DS and DNSKEY detected.

✓
CAA policy5 / 5 pts · Dns

Certificate authority restriction.

✓
DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓
MX records20 / 20 pts · Mail

2 MX record(s).

✓
SPF25 / 25 pts · Mail

SPF policy published.

✓
DMARC25 / 25 pts · Mail

DMARC policy published.

✓
DKIM20 / 20 pts · Mail

A DKIM selector was verified.

!
MTA-STS0 / 5 pts · Mail

Mail transport policy.

✓
TLS-RPT5 / 5 pts · Mail

TLS reporting policy.

✓
Valid TLS certificate55 / 55 pts · Security

121 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers23 / 35 pts · Security

6 of 9 evaluated headers detected.

!
PTR reverse DNS0 / 30 pts · Network

PTR not detected.

✓
IPv4 diversity35 / 35 pts · Network

Two or more IPv4 addresses receive full points.

✓
IPv6 connectivity35 / 35 pts · Network

AAAA availability.

✓
DNS resolution40 / 40 pts · Availability

At least one address family must resolve.

✓
HTTP response40 / 40 pts · Availability

HTTP/2 200

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

4 record(s)
151.101.2.217
151.101.194.217
151.101.66.217
151.101.130.217

AAAA

4 record(s)
2a04:4e42:400::729
2a04:4e42::729
2a04:4e42:200::729
2a04:4e42:600::729

CNAME

0 record(s)
—

Not configured

MX

2 record(s)
10 mx.ams1.isc.org.
5 mx.pao1.isc.org.

TXT

7 record(s)
"v=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 ~all"
"_globalsign-domain-verification=ckxXdoIq27XGYE4ATbBYQOBeV7PTJWRxYe-PXDyzMX"
"MS=2583E0E0DCCBF33EC6DAFF0B4BFBAF78FFCF7AD0"
"F8C4EB9011"
"google-site-verification=wg4m8dWi3XVPRYmtBoy6xSKp3juhxIWa6UdxjZkNQCg"
"google-site-verification=grXE1SbXWNed6C5yQgI8fwxgucE0DppnbICbhZr9qG0"
"google-site-verification=6v652rgkk_kI6Ky32iGdxqXjQ4_BAd5DYKsrnRXKUiE"

NS

5 record(s)
ns3.isc.org.
nsp.dnsnode.net.
ns.isc.afilias-nst.info.
ns1.isc.org.
ns2.isc.org.

SOA

1 record(s)
ns-int.isc.org. hostmaster.isc.org. 2026080708 7200 3600 24796800 3600

CAA

14 record(s)
0 issuewild "trust-provider.com"
0 issuewild "globalsign.com"
0 issue "globalsign.com"
0 issue "pki.goog"
0 issue "Digicert.com"
0 issuewild "comodoca.com"
0 issue "certainly.com"
0 issue "sectigo.com"
0 issuewild "sectigo.com"
0 iodef "mailto:hostmaster@isc.org"
0 issuewild "certainly.com"
0 issue "letsencrypt.org"
0 issuewild "usertrust.com"
0 issue "comodoca.com"

DS

1 record(s)
7250 13 2 A30B3F78B6DDE9A4A9A2AD0C805518B4F49EC62E7D3F4531D33DE697 CDA01CB2

DNSKEY

2 record(s)
257 3 13 zEoOfseNFDM+E8spu7RR2Ar/GzFqAehe4yapWLiv6McIUF6xmI5GcIQ3 +uLAizS2cNWHt6EArVj8ogjtrRXwfw==
256 3 13 1CS+VQcRn4lGTK+b3wDjVO0hFDx4DV7s3Q1Fwxuq9ahd255FRny4f4vd ZOMMMxpbRH5Zhwoh/706IV0v9JwjlA==

RRSIG

6 record(s)
DNSKEY 13 2 3600 20260816041658 20260802034313 7250 isc.org. 8i8FlVvYwSUmJoR2P95BB6EAD1e3uhS9DT1o4rGys7u2+UwdnKnw6zHW ZMatPP3CU2KV3wB75QfDYS6Ia1+V6A==
MX 13 2 300 20260815184324 20260801175109 27566 isc.org. s8OH3edUfEqSAS4zKF5xXnb//b09b74ZrWvHKFaXCopJnDTvcUf//QGi eyRyjBe4ysQ0YadvN141s14pNIFAdA==
NS 13 2 7200 20260815184324 20260801175109 27566 isc.org. WptAd7svbknoDuoIfeyaVpWwWobY4RBMiED80nJNqf70vnXQl2Twr6my OM0xlAJBXnBzGed3tiq+Rku/uzt8PA==
A 13 2 300 20260815184324 20260801175109 27566 isc.org. +QCgbAqAx+TJo3VBNo9pOeR4PqOinr4NOzsvEyiOdqJU/xlxPdH5MopP 8g66Oz3nAa1SngNc1TYgFCPkRDtHog==
DS 8 2 3600 20260822152352 20260801142352 44925 org. TGOXbK9909H5oCGKpNpEivUkGoJIbe5FGQ3W/PfSqcl5sGE1b5KQ6Hwd FGv7q40iY82GJb+xE+xzNr0UHBG1ZvcpHFGvlogPYCme8+E5ceYVzftI +AvPdcV0+1MDSBxvRAllvZLIDBV4CEmSKybcBHkSR7c7wh6X+mw3fpVy NPU=
CAA 13 2 7200 20260815184324 20260801175109 27566 isc.org. Y7zFjoQRhI7MgZC0wPM+6Uws1fz4CzX3g5nS4cVEf527G4vhuj6utzOb dVS2I08gZWYBzzzNje8cLcyButddkA==

NSEC

1 record(s)
_acme-challenge.isc.org. A NS SOA MX TXT AAAA NAPTR RRSIG NSEC DNSKEY CDS CDNSKEY CAA TYPE65534

NSEC3

0 record(s)
—

Not configured

SRV

0 record(s)
—

Not configured

NAPTR

1 record(s)
20 0 "S" "SIP+D2U" "" _sip._udp.isc.org.

TLSA

0 record(s)
—

Not configured

SSHFP

0 record(s)
—

Not configured

SPF

Configured
v=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 ~all

DMARC

Configured
v=DMARC1; p=none; sp=reject; rua=mailto:0rzssdyk@ag.dmarcian.com; ruf=mailto:0rzssdyk@fr.dmarcian.com, mailto:dmarcforensic@isc.org; fo=1;

DKIM

Selector k2
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAv2aC2KjGKLOwTweBY5A9RpjsxaBXR9r7OAU6U8/zn92ivImI75naUujWbItRI/QmL1jy5PWGqLwoUA0b90ObWaLDc+i9MtTNmGeWO009hr20fIxhGg6XBT2kjZ1DTThopSe1nAndsupmcBwlQ5Q6LJ+ZAxLcujnPIxM0ZBLmgpkv8u6RfY4eFP8OLvdAW3oSuB0DyLDigQX4Sj8wBO4YIdQH6AAmBeOsidsKAFNFUCpc3vCxtBDR12U+cBg724l3sBkMQ8evnz6idnqxq9QAVYh8k4kJ+RP+6cqTdy7LjIm8xY/bQNpQIpGUAuDo2DjLcCDun9DAI4Q/3z+Q0o9QuQIDAQAB;

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
ISC - ISC
Description
Open source software information, blogs, events, downloads and support
Final URL
https://www.isc.org/
HTTP status
206

HTTP

Status
HTTP/2 200
Final URL
https://www.isc.org/
Version
3
Server
Apache
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
GlobalSign nv-sa
CN
*.isc.org
Valid from
2025-11-06T01:16:30-06:00
Valid until
2026-12-08T01:16:29-06:00
Days remaining
121
Protocol
TLSv1.2
Cipher
ECDHE-RSA-AES128-GCM-SHA256

Security headers

6 active
✓
HSTSImplemented
✓
Content Security PolicyImplemented
✓
X-Content-Type-OptionsImplemented
✓
X-Frame-OptionsImplemented
✓
Referrer PolicyImplemented
✓
Permissions PolicyImplemented
—
Cross-Origin-Opener-PolicyNot detected
—
Cross-Origin-Embedder-PolicyNot detected
—
Cross-Origin-Resource-PolicyNot detected

DNS propagationComparison across public resolvers

Public resolver comparison

Consistent
✓
Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency
Google
8.8.8.8
151.101.130.217, 151.101.194.217, 151.101.2.217, 151.101.66.217
40,53 ms
Cloudflare
1.1.1.1
151.101.130.217, 151.101.194.217, 151.101.2.217, 151.101.66.217
82,06 ms
Quad9
9.9.9.9
151.101.130.217, 151.101.194.217, 151.101.2.217, 151.101.66.217
86,01 ms
OpenDNS
208.67.222.222
151.101.130.217, 151.101.194.217, 151.101.2.217, 151.101.66.217
239,81 ms
AdGuard
94.140.14.14
151.101.130.217, 151.101.194.217, 151.101.2.217, 151.101.66.217
442,96 ms

IP, geolocation and ASNAssociated network information

151.101.2.217

No data
success
No
country
region
city
asn
organization
isp

151.101.194.217

No data
success
No
country
region
city
asn
organization
isp

151.101.66.217

No data
success
No
country
region
city
asn
organization
isp

151.101.130.217

No data
success
No
country
region
city
asn
organization
isp

Visitor information

Visitor
ip
216.73.217.62
reverse
country
country_code
region
city
latitude
longitude
isp
organization
asn
timezone
browser
Other
os
Other
language
user_agent
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
is_bot
Yes
cloudflare
No

SMTPEmail port connectivity

mx.ams1.isc.org

Port 25: Closed/unreachable - 29.3 ms - 
Port 465: Closed/unreachable - 97.5 ms - 
Port 587: Closed/unreachable - 97.7 ms -

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