signal.org

24 hours
100.00%
7 days
100.00%
30 days
100.00%
IPv4 / IPv6
2 2
SSL Certificate
58d
Security Headers
2/6
Badges: Uptime Status
Response Time & Availability (24h)
SSL / TLS Certificate
58
days left
Valid
Mar 11, 2026 Jun 9, 2026
Issued → Expires
Subject commonName=signal.org
Issuer countryName=US, organizationName=Google Trust Services, commonName=WE1
Valid From 2026-03-11 15:32
Expires 2026-06-09 16:32
Serial Number 771CBFA3C317FE511364A69AB8E0C001
SHA-256 Fingerprint 72:01:f2:fb:02:d2:6d:20:14:80:96:17:98:32:5d:0d:bc:5f:54:0e:da:03:9a:62:6f:df:81:c4:1b:8e:03:d4
Subject Alt Names signal.org
Last Checked 2026-04-11 21:58:26
Latest HTTP Response Details
Final URL https://signal.org/
Status Code 200
Response Time 118 ms
Content Size 22 KB (21.7 KB)
Content Type text/html; charset=utf-8
Server cloudflare
TLS Version TLSv1.3
TLS Cipher TLS_AES_256_GCM_SHA384
Redirects 0
Checked 2026-04-11 21:58:26
Security Headers 2/6
Header Status Value
Strict-Transport-Security Missing —
Content-Security-Policy Missing —
X-Frame-Options Missing —
X-Content-Type-Options Present nosniff
Referrer-Policy Present strict-origin-when-cross-origin
Permissions-Policy Missing —
DNS Intelligence (24h)
Avg Resolution
8.4 ms
Min / Max
5.7 / 14.7 ms
Record Types
6
Lookups (24h)
18
DNS Records
A
104.18.10.47 104.18.11.47
300s 12.4ms
AAAA
2606:4700::6812:a2f 2606:4700::6812:b2f
300s 14.7ms
MX
1 aspmx.l.google.com
5 alt1.aspmx.l.google.com
5 alt2.aspmx.l.google.com
10 aspmx2.googlemail.com
10 aspmx3.googlemail.com
300s 25.1ms
NS
zita.ns.cloudflare.com casey.ns.cloudflare.com
86400s 14.0ms
TXT
SPF (1)
v=spf1 include:_spf.google.com ~all
Domain Verification (3)
anthropic-domain-verification-w1sp3g=yHrFLemYCHqI7Xa0hqH80GBFR
google-site-verification=E9NOI9LjgLb5GEyCWbHTr8yumWFOdOuCtFkCeQ_GhVM
atlassian-domain-verification=E0za3YlmgyiE3wck1TFwdW1j0dbRUDsSNh9VBjr… atlassian-domain-verification=E0za3YlmgyiE3wck1TFwdW1j0dbRUDsSNh9VBjrOx4yMWdOdauAaLczjR2c/FFmr
TXT Record (1)
MS=ms64370964
300s 7.4ms
SOA
Primary NS
casey.ns.cloudflare.com
Admin
dns@cloudflare.com
Serial: 2400634979 Refresh: 2h Retry: 40m Expire: 7d Min TTL: 30m
1800s 8.5ms
Email Security Posture
MX Records
SPF
Details v=spf1 include:_spf.google.com ~all
DMARC
Details v=DMARC1; p=quarantine; pct=100; rua=mailto:dmarc@signal.org
BIMI
MTA-STS
Strong
Overall
DNS Propagation Consistent
Resolver IPs Returned Response Time Status
Quad9 104.18.10.47 104.18.11.47 4.48ms
Google 104.18.10.47 104.18.11.47 21.16ms
AdGuard 104.18.10.47 104.18.11.47 12.19ms
OpenDNS 104.18.10.47 104.18.11.47 18.21ms
Cloudflare 104.18.10.47 104.18.11.47 10.01ms
WHOIS / Domain Registration
Registrar
MarkMonitor Inc.
Created
2001-04-15
Updated
2025-06-08
Expires
2028-04-15
Name Servers (WHOIS)
casey.ns.cloudflare.com zita.ns.cloudflare.com
Domain Status
clientDeleteProhibited serverDeleteProhibited clientTransferProhibited serverTransferProhibited clientUpdateProhibited serverUpdateProhibited
DNSSEC
Enabled
WHOIS Last Checked
2026-04-11 21:58
Resolution Time (A/AAAA recent)
19:52 21:58
Time Type Values TTL Resolution Nameserver
21:58:25 SOA casey.ns.cloudflare.com dns.cloudflare.com 2400634979 10000 2400 604800 1800 1800s 8.5 ms 10.89.0.1
21:58:25 TXT
5 records MS=ms64370964
MS=ms64370964 v=spf1 include:_spf.google.com ~all anthropic-domain-verification-w1sp3g=yHrFLemYCHqI7Xa0hqH80GBFR google-site-verification=E9NOI9LjgLb5GEyCWbHTr8yumWFOdOuCtFkCeQ_GhVM atlassian-domain-verification=E0za3YlmgyiE3wck1TFwdW1j0dbRUDsSNh9VBjrOx4yMWdOdauAaLczjR2c/FFmr
300s 7.4 ms 10.89.0.1
21:58:25 NS zita.ns.cloudflare.com casey.ns.cloudflare.com 86400s 14.0 ms 10.89.0.1
21:58:25 MX 1 aspmx.l.google.com 5 alt1.aspmx.l.google.com 5 alt2.aspmx.l.google.com 10 aspmx2.googlemail.com 10 aspmx3.googlemail.com 300s 25.1 ms 10.89.0.1
21:58:25 AAAA 2606:4700::6812:a2f 2606:4700::6812:b2f 300s 14.7 ms 10.89.0.1
21:58:25 A 104.18.10.47 104.18.11.47 300s 12.4 ms 10.89.0.1
20:55:59 SOA casey.ns.cloudflare.com dns.cloudflare.com 2400634979 10000 2400 604800 1800 1800s 4.5 ms 10.89.0.1
20:55:59 TXT
5 records MS=ms64370964
MS=ms64370964 v=spf1 include:_spf.google.com ~all anthropic-domain-verification-w1sp3g=yHrFLemYCHqI7Xa0hqH80GBFR google-site-verification=E9NOI9LjgLb5GEyCWbHTr8yumWFOdOuCtFkCeQ_GhVM atlassian-domain-verification=E0za3YlmgyiE3wck1TFwdW1j0dbRUDsSNh9VBjrOx4yMWdOdauAaLczjR2c/FFmr
300s 5.0 ms 10.89.0.1
20:55:59 NS zita.ns.cloudflare.com casey.ns.cloudflare.com 3363s 1.2 ms 10.89.0.1
20:55:58 MX 1 aspmx.l.google.com 5 alt1.aspmx.l.google.com 5 alt2.aspmx.l.google.com 10 aspmx2.googlemail.com 10 aspmx3.googlemail.com 300s 6.3 ms 10.89.0.1
20:55:58 AAAA 2606:4700::6812:a2f 2606:4700::6812:b2f 300s 5.7 ms 10.89.0.1
20:55:58 A 104.18.10.47 104.18.11.47 300s 6.1 ms 10.89.0.1
19:52:25 SOA casey.ns.cloudflare.com dns.cloudflare.com 2400634979 10000 2400 604800 1800 1800s 4.2 ms 10.89.0.1
19:52:25 TXT
5 records MS=ms64370964
MS=ms64370964 v=spf1 include:_spf.google.com ~all anthropic-domain-verification-w1sp3g=yHrFLemYCHqI7Xa0hqH80GBFR google-site-verification=E9NOI9LjgLb5GEyCWbHTr8yumWFOdOuCtFkCeQ_GhVM atlassian-domain-verification=E0za3YlmgyiE3wck1TFwdW1j0dbRUDsSNh9VBjrOx4yMWdOdauAaLczjR2c/FFmr
300s 5.9 ms 10.89.0.1
19:52:25 NS zita.ns.cloudflare.com casey.ns.cloudflare.com 86400s 5.3 ms 10.89.0.1
19:52:25 MX 1 aspmx.l.google.com 5 alt1.aspmx.l.google.com 5 alt2.aspmx.l.google.com 10 aspmx2.googlemail.com 10 aspmx3.googlemail.com 300s 6.1 ms 10.89.0.1
19:52:25 AAAA 2606:4700::6812:a2f 2606:4700::6812:b2f 300s 6.0 ms 10.89.0.1
19:52:25 A 104.18.10.47 104.18.11.47 300s 5.7 ms 10.89.0.1
Open Ports 16
Open Ports
16
IPs Scanned
16
Port Protocol Service IP Address Status Latency Banner
80 TCP http 104.18.11.47 Open 2.1 ms —
80 TCP http 2606:4700::6812:b2f Open 2.9 ms —
80 TCP http 104.18.10.47 Open 2.3 ms —
80 TCP http 2606:4700::6812:a2f Open 24.2 ms —
443 TCP https 2606:4700::6812:a2f Open 12.6 ms —
443 TCP https 2606:4700::6812:b2f Open 2.8 ms —
443 TCP https 104.18.10.47 Open 3.1 ms —
443 TCP https 104.18.11.47 Open 2.2 ms —
8080 TCP http-alt 2606:4700::6812:a2f Open 32.3 ms —
8080 TCP http-alt 104.18.10.47 Open 3.2 ms —
8080 TCP http-alt 104.18.11.47 Open 4.0 ms —
8080 TCP http-alt 2606:4700::6812:b2f Open 3.4 ms —
8443 TCP https-alt 104.18.10.47 Open 4.3 ms —
8443 TCP https-alt 2606:4700::6812:b2f Open 3.7 ms —
8443 TCP https-alt 2606:4700::6812:a2f Open 11.1 ms —
8443 TCP https-alt 104.18.11.47 Open 2.3 ms —
Technology Stack 13 detected
HTTP/2
HTTP/3 (QUIC)
13
Technologies
CDN 1
Cloudflare
90%
CF-Ray header present
DNS 1
Cloudflare DNS
85%
NS record: zita.ns.cloudflare.com
Email 2
Google Workspace
85%
MX record: 1 aspmx.l.google.com
SPF Record
85%
TXT SPF: v=spf1 include:_spf.google.com ~all
Library 1
jQuery
70%
jQuery versioned script
Protocol 1
HTTP/3 (QUIC)
90%
Alt-Svc h3 advertised
Security 2
Referrer-Policy
90%
Referrer-Policy present
X-Content-Type-Options
90%
nosniff header
Social 2
Open Graph
70%
Open Graph meta tags
Twitter Cards
70%
Twitter Card meta
Verification 3
Atlassian
85%
TXT verification: atlassian-domain-verification=E0za3YlmgyiE3wck1TFwdW1j0dbRUDs…
Google Search Console
85%
TXT verification: google-site-verification=E9NOI9LjgLb5GEyCWbHTr8yumWFOdOuCtFkC…
Microsoft 365
85%
TXT verification: MS=ms64370964
Active IP Addresses
IP Address Version Reverse DNS CIDR Country City ASN First Seen Last DNS Hits Misses Uptime % Avg Latency
2606:4700::6812:a2f IPv6 — 2606:4700::/48 — — AS13335 Cloudflare, Inc. 2026-04-11 19:52 2026-04-11 21:58 3 0 100.0% 4.2 ms
2606:4700::6812:b2f IPv6 — 2606:4700::/48 — — AS13335 Cloudflare, Inc. 2026-04-11 19:52 2026-04-11 21:58 3 0 100.0% 4.3 ms
104.18.10.47 IPv4 — 104.18.10.0/24 — — AS13335 Cloudflare, Inc. 2026-04-11 19:52 2026-04-11 21:58 3 0 100.0% 4.4 ms
104.18.11.47 IPv4 — 104.18.11.0/24 — — AS13335 Cloudflare, Inc. 2026-04-11 19:52 2026-04-11 21:58 3 0 100.0% 4.2 ms
Discovered Sub-domains 10
Wordlist Brute-force 10

1. cdn.signal.org
2. cdn2.signal.org
3. cdn3.signal.org
4. chat.signal.org
5. internal.signal.org
6. shop.signal.org
7. status.signal.org
8. storage.signal.org
9. support.signal.org
10. www.signal.org
Recent HTTP Checks (24 h)
Total Checks
3
Success Rate
100%
Avg Response
81 ms
Min / Max
56 / 118 ms
Recent Checks
19:52 21:58
Time Status Code Response Agent Error
21:58:26 UP 200 118 ms prod-local —
20:55:59 UP 200 56 ms prod-local —
19:52:25 UP 200 68 ms prod-local —
Incident History

No incidents recorded — all clear!