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85
Total
80
DNS
90
Email
69
Security
100
Network
100
Availability
Domainntp.org
IPv42
IPv61
MX records1
StatusActive
Domain technical report

NTP: Network Time Protocol

ntp.org

The NTP Project conducts Research and Development in NTP, a protocol designed to synchronize the clocks of computers over a network to a common timebase.

Generated: 2026-08-08T20:12:45-05:00 · Cached result

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IPv42
IPv61
MX1
NS4

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

2 IPv4 address(es) detected.

✓
IPv6 (AAAA)10 / 10 pts · Dns

1 IPv6 address(es) detected.

✓
Name server redundancy20 / 20 pts · Dns

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

✓
SOA record10 / 10 pts · Dns

Authoritative zone record.

!
DNSSEC chain0 / 15 pts · Dns

Both DS and DNSKEY are required.

!
CAA policy0 / 5 pts · Dns

Certificate authority restriction.

✓
DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓
MX records20 / 20 pts · Mail

1 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-RPT0 / 5 pts · Mail

TLS reporting policy.

✓
Valid TLS certificate55 / 55 pts · Security

85 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers4 / 35 pts · Security

1 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: slb0.chi1.ntfo.org

✓
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/1.1 200 OK

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

2 record(s)
204.93.207.22
209.148.110.246

AAAA

1 record(s)
2001:1838:2000:41b::80:0

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
10 mx0.chi1.ntfo.org.

TXT

5 record(s)
"_globalsign-domain-verification=O60kZMoa5mBPIKKqd9FSRXcGUhU6s3rzZHzWNLAlL7"
"google-site-verification=1BTIwQr05WxuBXsED2L-cWc-cC7_8NDYKoWMsmAyR3g"
"google-site-verification=ISMNEfck75SW97AiPz0acClFpICIejjA6F5ijoHccZM"
"v=spf1 a mx ip4:204.93.207.0/27 ip4:66.220.13.234 ip4:66.220.13.237 ip6:2001:470:1:205::234 ip6:2001:470:1:205::/64 ~all"
"ntp-libera-310"

NS

4 record(s)
dns2.udel.edu.
anyns.pch.net.
dns1.udel.edu.
ns1.everett.org.

SOA

1 record(s)
ns1.everett.org. postmaster.ntp.org. 2026073100 3600 14400 604800 3600

CAA

0 record(s)
—

Not configured

DS

0 record(s)
—

Not configured

DNSKEY

0 record(s)
—

Not configured

RRSIG

0 record(s)
—

Not configured

NSEC

0 record(s)
—

Not configured

NSEC3

0 record(s)
—

Not configured

SRV

0 record(s)
—

Not configured

NAPTR

0 record(s)
—

Not configured

TLSA

0 record(s)
—

Not configured

SSHFP

0 record(s)
—

Not configured

SPF

Configured
v=spf1 a mx ip4:204.93.207.0/27 ip4:66.220.13.234 ip4:66.220.13.237 ip6:2001:470:1:205::234 ip6:2001:470:1:205::/64 ~all

DMARC

Configured
v=DMARC1; p=quarantine; rua=mailto:xpvutgi3@ag.dmarcian.com; ruf=mailto:xpvutgi3@fr.dmarcian.com; sp=quarantine; pct=100

DKIM

Selector mail
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC/V8+tx4Er0qCUxetMiCMRAR9G469YOIFuX4vojpyHvutbMTeihago9p7Gwj1PwI2r4fTqigGcqtcSFz/qrFBBhGTJPAqKJRO7faqe/BK2Z8sl9C8Czm/iplJE01sMn6HwVzcfDRL9oFiQLcq/wtvOBp/VbMB8KOKu69oByRPiVQIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
NTP: Network Time Protocol
Description
The NTP Project conducts Research and Development in NTP, a protocol designed to synchronize the clocks of computers over a network to a common timebase.
Final URL
https://www.ntp.org/
HTTP status
206

HTTP

Status
HTTP/1.1 200 OK
Final URL
https://www.ntp.org/
Version
2
Server
Apache
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Let's Encrypt
CN
ntp.org
Valid from
2026-08-03T23:02:17-05:00
Valid until
2026-11-01T22:02:16-06:00
Days remaining
85
Protocol
TLSv1.2
Cipher
ECDHE-RSA-AES256-GCM-SHA384

Security headers

1 active
✓
HSTSImplemented
—
Content Security PolicyNot detected
—
X-Content-Type-OptionsNot detected
—
X-Frame-OptionsNot detected
—
Referrer PolicyNot detected
—
Permissions PolicyNot detected
—
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
204.93.207.22, 209.148.110.246
28,82 ms
Cloudflare
1.1.1.1
204.93.207.22, 209.148.110.246
45,59 ms
Quad9
9.9.9.9
204.93.207.22, 209.148.110.246
40,11 ms
OpenDNS
208.67.222.222
204.93.207.22, 209.148.110.246
46,64 ms
AdGuard
94.140.14.14
204.93.207.22, 209.148.110.246
56,34 ms

IP, geolocation and ASNAssociated network information

204.93.207.22

No data
success
No
country
region
city
asn
organization
isp

209.148.110.246

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

mx0.chi1.ntfo.org

Port 25: Closed/unreachable - 72.5 ms - 
Port 465: Closed/unreachable - 79.9 ms - 
Port 587: Closed/unreachable - 99.2 ms -

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