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77
Total
70
DNS
90
Email
65
Security
50
Network
100
Availability
Domainsdf.org
IPv41
IPv60
MX records1
StatusActive
Domain technical report

SDF Public Access UNIX System - Free Shell Account and Shell Access

sdf.org

Generated: 2026-08-10T18:01:11-05:00 · Cached result

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IPv41
IPv60
MX1
NS4

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

1 IPv4 address(es) detected.

!
IPv6 (AAAA)0 / 10 pts · Dns

0 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

57 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

!
HTTP security headers0 / 35 pts · Security

0 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: sdf.org

i
IPv4 diversity20 / 35 pts · Network

Two or more IPv4 addresses receive full points.

!
IPv6 connectivity0 / 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

1 record(s)
205.166.94.16

AAAA

0 record(s)
—

Not configured

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
50 mx.sdf.org.

TXT

2 record(s)
"google-site-verification=f_IZGvm9STb9qD_OALNWOBBqguBJc0eJXWTvTkKjXSc"
"v=spf1 ip4:205.166.94.0/24 -all"

NS

4 record(s)
ns-a.sdf.org.
ns-d.sdf.org.
ns-c.sdf.org.
ns-b.sdf.org.

SOA

1 record(s)
sdf.org. hostmaster.sdf.org. 2026080902 14400 1800 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 ip4:205.166.94.0/24 -all

DMARC

Configured
v=DMARC1;p=quarantine;sp=quarantine;rua=mailto:dmarc@sdf.org

DKIM

Selector default
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCnruPrCnfLHG7CQ0hKpAaCFj0FCEgV7nOC4JSF3IV6AxRjKF06JYu133iHMmOUyweD0fJczLvKnmT3eV2v7PhzsCUOCPNMzLl5F1m2k9HC71XjfbxuXwV146iDumT1A1uIAYQhVfVQlOSFYc75Di1vpOyxIHMZMvYCDljFzuajYQIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
SDF Public Access UNIX System - Free Shell Account and Shell Access
Description
Final URL
https://sdf.org/
HTTP status
200

HTTP

Status
HTTP/1.1 200 OK
Final URL
https://sdf.org/
Version
2
Server
Apache/2.4.65 (Unix) OpenSSL/3.4.1 PHP/8.3.25
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Let's Encrypt
CN
sdf.org
Valid from
2026-07-09T10:33:57-05:00
Valid until
2026-10-07T10:33:56-05:00
Days remaining
57
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384

Security headers

0 active
—
HSTSNot detected
—
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
205.166.94.16
53,10 ms
Cloudflare
1.1.1.1
205.166.94.16
30,39 ms
Quad9
9.9.9.9
205.166.94.16
49,57 ms
OpenDNS
208.67.222.222
205.166.94.16
91,63 ms
AdGuard
94.140.14.14
205.166.94.16
67,58 ms

IP, geolocation and ASNAssociated network information

205.166.94.16

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.sdf.org

Port 25: Closed/unreachable - 20.5 ms - 
Port 465: Closed/unreachable - 72.1 ms - 
Port 587: Closed/unreachable - 51.8 ms - 220 mx.sdf.org ESMTP Sendmail 8.18.1/8.14.3; Mon, 10 Aug 2026 23:01:11 GMT

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