sapper.svelte.dev
A+
24 hours
100.00%
7 days
100.00%
30 days
100.00%
IPv4 / IPv6
4
4
SSL Certificate
86d
Security Headers
0/6
Status Badges
Click any snippet to copy. Use Markdown for GitHub READMEs, HTML for websites.
| Badge | Markdown | HTML |
|---|---|---|
|
[](https://updown.website/site/sapper.svelte.dev/) |
<a href="https://updown.website/site/sapper.svelte.dev/"><img src="https://updown.website/badge/sapper.svelte.dev/status.svg" alt="Status"></a> |
|
[](https://updown.website/site/sapper.svelte.dev/) |
<a href="https://updown.website/site/sapper.svelte.dev/"><img src="https://updown.website/badge/sapper.svelte.dev/uptime.svg" alt="Uptime"></a> |
|
[](https://updown.website/site/sapper.svelte.dev/) |
<a href="https://updown.website/site/sapper.svelte.dev/"><img src="https://updown.website/badge/sapper.svelte.dev/response-time.svg" alt="Response Time"></a> |
|
[](https://updown.website/site/sapper.svelte.dev/) |
<a href="https://updown.website/site/sapper.svelte.dev/"><img src="https://updown.website/badge/sapper.svelte.dev/ssl.svg" alt="SSL"></a> |
|
[](https://updown.website/site/sapper.svelte.dev/) |
<a href="https://updown.website/site/sapper.svelte.dev/"><img src="https://updown.website/badge/sapper.svelte.dev/cwv.svg" alt="Performance"></a> |
|
[](https://updown.website/site/sapper.svelte.dev/) |
<a href="https://updown.website/site/sapper.svelte.dev/"><img src="https://updown.website/badge/sapper.svelte.dev/cwv.svg?category=accessibility" alt="Accessibility"></a> |
|
[](https://updown.website/site/sapper.svelte.dev/) |
<a href="https://updown.website/site/sapper.svelte.dev/"><img src="https://updown.website/badge/sapper.svelte.dev/cwv.svg?category=seo" alt="SEO"></a> |
|
[](https://updown.website/site/sapper.svelte.dev/) |
<a href="https://updown.website/site/sapper.svelte.dev/"><img src="https://updown.website/badge/sapper.svelte.dev/security-headers.svg" alt="Security Headers"></a> |
|
[](https://updown.website/site/sapper.svelte.dev/) |
<a href="https://updown.website/site/sapper.svelte.dev/"><img src="https://updown.website/badge/sapper.svelte.dev/uptime.svg?period=24h" alt="Uptime 24h"></a> |
|
[](https://updown.website/site/sapper.svelte.dev/) |
<a href="https://updown.website/site/sapper.svelte.dev/"><img src="https://updown.website/badge/sapper.svelte.dev/incidents.svg" alt="Incidents"></a> |
|
[](https://updown.website/site/sapper.svelte.dev/) |
<a href="https://updown.website/site/sapper.svelte.dev/"><img src="https://updown.website/badge/sapper.svelte.dev/ipv46.svg" alt="IPv4/IPv6"></a> |
Site Health (24 h)
HTTP Response
DNS Lookup
Ping
Up
Down
Reports
Incident
Monitoring
Recent HTTP Checks (24 h)
Total Checks
8
Success Rate
100%
Avg Response
65 ms
Min / Max
46
/
93 ms
Recent Checks
16:37
10:01
| Time | Status | Code | Response | Agent | Error |
|---|---|---|---|---|---|
| 10:01:03 | UP | 200 | 68 ms | prod-local | — |
| 08:38:47 | UP | 200 | 93 ms | prod-local | — |
| 05:22:39 | UP | 200 | 86 ms | prod-local | — |
| 02:41:55 | UP | 200 | 50 ms | prod-local | — |
| 01:19:24 | UP | 200 | 51 ms | prod-local | — |
| 22:51:45 | UP | 200 | 65 ms | prod-local | — |
| 17:47:19 | UP | 200 | 65 ms | prod-local | — |
| 16:37:43 | UP | 200 | 46 ms | prod-local | — |
Incident History
No incidents recorded — all clear!
Service Checks (Banner Grab)
2 up
0 down
| Status | Port | Service | Version | IP | Banner | Latency | Checked |
|---|---|---|---|---|---|---|---|
80 |
http | GitHub.com | 2606:50c0:8000::153 |
HTTP/1.1 301 Moved Permanently Connection: close Content-Length: 162 Server:… | 2.4 ms | 17 hours, 56 minutes ago | |
443 |
https | — | 2606:50c0:8000::153 |
— | 503.6 ms | 17 hours, 56 minutes ago |
Security
SSL / TLS Certificate
86
days left
Valid
Apr 19, 2026
Jul 18, 2026
Issued → Expires
| Subject | commonName=sapper.svelte.dev |
|---|---|
| Issuer | countryName=US, organizationName=Let's Encrypt, commonName=R12 |
| Valid From | 2026-04-19 03:56 |
| Expires | 2026-07-18 03:56 |
| Serial Number | 05274B4469482303567BD826C78FB194F269 |
| SHA-256 Fingerprint | d2:1f:4d:3e:d1:c2:5d:1c:35:1a:a3:f2:73:1f:33:a4:ea:0f:cd:32:44:48:c9:2c:23:9b:c4:16:f5:e9:ce:44 |
| Subject Alt Names | sapper.svelte.dev |
| Last Checked | 2026-04-22 10:01:03 |
Latest HTTP Response Details
| Final URL | https://sapper.svelte.dev/ |
|---|---|
| Status Code | 200 |
| Response Time | 68 ms |
| Content Size | 7 KB (7.0 KB) |
| Content Type | text/html; charset=utf-8 |
| Server | GitHub.com |
| TLS Version | TLSv1.3 |
|---|---|
| TLS Cipher | TLS_AES_128_GCM_SHA256 |
| Redirects | 0 |
| Checked | 2026-04-22 10:01:03 |
Email Security Posture
MX Records
SPF
DMARC
BIMI
MTA-STS
Weak
Overall
DNS & Network
DNS Intelligence (24h)
Avg Resolution
12.6 ms
Min / Max
10.7
/
17.4 ms
Record Types
5
Lookups (24h)
64
DNS Records
A
185.199.110.153
185.199.108.153
185.199.109.153
185.199.111.153
3600s
11.6ms
AAAA
2606:50c0:8000::153
2606:50c0:8001::153
2606:50c0:8002::153
2606:50c0:8003::153
3600s
11.7ms
CNAME
sveltejs.github.io
299s
1.2ms
CAA
| Flag | Tag | Value |
|---|---|---|
| 0 | issue | digicert.com |
| 0 | issue | letsencrypt.org |
| 0 | issue | sectigo.com |
| 0 | issuewild | digicert.com |
| 0 | issuewild | letsencrypt.org |
| 0 | issuewild | sectigo.com |
3600s
45.9ms
PTR
cdn-185-199-111-153.github.com
2223s
0.7ms
DNS Propagation Consistent
| Resolver | IPs Returned | Response Time | Status |
|---|---|---|---|
| Quad9 |
185.199.108.153
185.199.109.153
185.199.110.153
185.199.111.153
|
33.6ms | |
185.199.108.153
185.199.109.153
185.199.110.153
185.199.111.153
|
24.34ms | ||
| AdGuard |
185.199.108.153
185.199.109.153
185.199.110.153
185.199.111.153
|
189.26ms | |
| OpenDNS |
185.199.108.153
185.199.109.153
185.199.110.153
185.199.111.153
|
59.63ms | |
| Cloudflare |
185.199.108.153
185.199.109.153
185.199.110.153
185.199.111.153
|
11.97ms |
WHOIS / Domain Registration
DNSSEC
—
WHOIS Last Checked
2026-04-21 10:42
Resolution Time (A/AAAA recent)
01:19
10:01
| Time | Type | Values | TTL | Resolution | Nameserver |
|---|---|---|---|---|---|
| 10:01:02 | PTR |
185.199.111.153
|
2223s | 0.7 ms | — |
| 10:01:02 | PTR |
185.199.110.153
|
1370s | 0.9 ms | — |
| 10:01:02 | PTR |
185.199.109.153
|
3501s | 0.8 ms | — |
| 10:01:02 | PTR |
185.199.108.153
|
1523s | 0.8 ms | — |
| 10:01:02 | CAA |
0 issue "digicert.com"
0 issue "letsencrypt.org"
0 issue "sectigo.com"
0 issuewild "digicert.com"
0 issuewild "letsencrypt.org"
0 issuewild "sectigo.com"
|
3600s | 45.9 ms | 10.89.0.1 |
| 10:01:02 | CNAME |
sveltejs.github.io
|
299s | 1.2 ms | 10.89.0.1 |
| 10:01:02 | AAAA |
2606:50c0:8000::153
2606:50c0:8001::153
2606:50c0:8002::153
2606:50c0:8003::153
|
3600s | 11.7 ms | 10.89.0.1 |
| 10:01:02 | A |
185.199.110.153
185.199.108.153
185.199.109.153
185.199.111.153
|
3600s | 11.6 ms | 10.89.0.1 |
| 08:38:47 | PTR |
185.199.111.153
|
3328s | 1.1 ms | — |
| 08:38:47 | PTR |
185.199.110.153
|
3328s | 1.0 ms | — |
| 08:38:47 | PTR |
185.199.109.153
|
2340s | 0.9 ms | — |
| 08:38:47 | PTR |
185.199.108.153
|
465s | 4.3 ms | — |
| 08:38:47 | CAA |
0 issue "digicert.com"
0 issue "letsencrypt.org"
0 issue "sectigo.com"
0 issuewild "digicert.com"
0 issuewild "letsencrypt.org"
0 issuewild "sectigo.com"
|
3600s | 12.4 ms | 10.89.0.1 |
| 08:38:47 | CNAME |
sveltejs.github.io
|
299s | 1.4 ms | 10.89.0.1 |
| 08:38:47 | AAAA |
2606:50c0:8000::153
2606:50c0:8001::153
2606:50c0:8002::153
2606:50c0:8003::153
|
3600s | 12.2 ms | 10.89.0.1 |
| 08:38:47 | A |
185.199.108.153
185.199.109.153
185.199.110.153
185.199.111.153
|
3600s | 13.4 ms | 10.89.0.1 |
| 05:22:38 | PTR |
185.199.111.153
|
2871s | 0.8 ms | — |
| 05:22:38 | PTR |
185.199.110.153
|
1130s | 0.8 ms | — |
| 05:22:38 | PTR |
185.199.109.153
|
574s | 3.4 ms | — |
| 05:22:38 | PTR |
185.199.108.153
|
3570s | 0.6 ms | — |
| 05:22:38 | CAA |
0 issue "digicert.com"
0 issue "letsencrypt.org"
0 issue "sectigo.com"
0 issuewild "digicert.com"
0 issuewild "letsencrypt.org"
0 issuewild "sectigo.com"
|
3600s | 26.8 ms | 10.89.0.1 |
| 05:22:38 | CNAME |
sveltejs.github.io
|
299s | 1.0 ms | 10.89.0.1 |
| 05:22:38 | AAAA |
2606:50c0:8000::153
2606:50c0:8001::153
2606:50c0:8002::153
2606:50c0:8003::153
|
3600s | 11.4 ms | 10.89.0.1 |
| 05:22:38 | A |
185.199.108.153
185.199.109.153
185.199.110.153
185.199.111.153
|
3600s | 14.5 ms | 10.89.0.1 |
| 02:41:55 | PTR |
185.199.111.153
|
3380s | 0.7 ms | — |
| 02:41:55 | PTR |
185.199.110.153
|
2722s | 0.8 ms | — |
| 02:41:55 | PTR |
185.199.109.153
|
2180s | 0.7 ms | — |
| 02:41:55 | PTR |
185.199.108.153
|
2722s | 0.8 ms | — |
| 02:41:55 | CAA |
0 issue "digicert.com"
0 issue "letsencrypt.org"
0 issue "sectigo.com"
0 issuewild "digicert.com"
0 issuewild "letsencrypt.org"
0 issuewild "sectigo.com"
|
3600s | 12.1 ms | 10.89.0.1 |
| 02:41:55 | CNAME |
sveltejs.github.io
|
299s | 1.2 ms | 10.89.0.1 |
| 02:41:55 | AAAA |
2606:50c0:8001::153
2606:50c0:8003::153
2606:50c0:8000::153
2606:50c0:8002::153
|
3600s | 12.1 ms | 10.89.0.1 |
| 02:41:55 | A |
185.199.108.153
185.199.109.153
185.199.110.153
185.199.111.153
|
3600s | 11.6 ms | 10.89.0.1 |
| 01:19:24 | PTR |
185.199.111.153
|
555s | 0.8 ms | — |
| 01:19:24 | PTR |
185.199.110.153
|
509s | 0.8 ms | — |
| 01:19:24 | PTR |
185.199.109.153
|
758s | 0.7 ms | — |
| 01:19:24 | PTR |
185.199.108.153
|
625s | 0.7 ms | — |
| 01:19:24 | CAA |
0 issue "digicert.com"
0 issue "letsencrypt.org"
0 issue "sectigo.com"
0 issuewild "digicert.com"
0 issuewild "letsencrypt.org"
0 issuewild "sectigo.com"
|
3600s | 13.5 ms | 10.89.0.1 |
| 01:19:24 | CNAME |
sveltejs.github.io
|
299s | 1.0 ms | 10.89.0.1 |
| 01:19:24 | AAAA |
2606:50c0:8000::153
2606:50c0:8001::153
2606:50c0:8002::153
2606:50c0:8003::153
|
3600s | 12.3 ms | 10.89.0.1 |
| 01:19:24 | A |
185.199.108.153
185.199.109.153
185.199.110.153
185.199.111.153
|
3600s | 11.8 ms | 10.89.0.1 |
| 22:51:44 | PTR |
185.199.111.153
|
2051s | 0.8 ms | — |
| 22:51:44 | PTR |
185.199.110.153
|
3440s | 0.7 ms | — |
| 22:51:44 | PTR |
185.199.109.153
|
3415s | 0.8 ms | — |
| 22:51:44 | PTR |
185.199.108.153
|
696s | 1.1 ms | — |
| 22:51:44 | CAA |
0 issue "digicert.com"
0 issue "letsencrypt.org"
0 issue "sectigo.com"
0 issuewild "digicert.com"
0 issuewild "letsencrypt.org"
0 issuewild "sectigo.com"
|
3600s | 12.8 ms | 10.89.0.1 |
| 22:51:44 | CNAME |
sveltejs.github.io
|
299s | 3.8 ms | 10.89.0.1 |
| 22:51:44 | AAAA |
2606:50c0:8000::153
2606:50c0:8001::153
2606:50c0:8002::153
2606:50c0:8003::153
|
3600s | 17.4 ms | 10.89.0.1 |
| 22:51:44 | A |
185.199.108.153
185.199.109.153
185.199.110.153
185.199.111.153
|
3600s | 13.1 ms | 10.89.0.1 |
| 17:47:18 | PTR |
185.199.111.153
|
3196s | 0.8 ms | — |
| 17:47:18 | PTR |
185.199.110.153
|
2626s | 0.9 ms | — |
Open Ports
6
Open Ports
6
IPs Scanned
6
| Port | Protocol | Service | IP Address | Status | Latency | Banner |
|---|---|---|---|---|---|---|
80 |
TCP | http | 2606:50c0:8000::153 |
Open | 3.0 ms | — |
80 |
TCP | http | 185.199.110.153 |
Open | 117.1 ms | — |
80 |
TCP | http | 185.199.108.153 |
Open | 2.6 ms | — |
443 |
TCP | https | 185.199.108.153 |
Open | 2.4 ms | — |
443 |
TCP | https | 2606:50c0:8000::153 |
Open | 1.6 ms | — |
443 |
TCP | https | 185.199.110.153 |
Open | 2.3 ms | — |
Active IP Addresses
| IP Address | Version | Reverse DNS | CIDR | Country | City | ASN | Reputation | First Seen | Last DNS | Hits | Misses | Uptime % | Avg Latency |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2606:50c0:8003::153 |
IPv6 | — |
2606:50c0:8003::/48
|
US | — | AS54113 Fastly, Inc. | Clean | 2026-04-19 17:39 | 2026-04-22 10:01 | 8 | 0 | 100.0% | 4.8 ms |
2606:50c0:8002::153 |
IPv6 | — |
2606:50c0:8002::/48
|
US | — | AS54113 Fastly, Inc. | Clean | 2026-04-19 17:39 | 2026-04-22 10:01 | 8 | 0 | 100.0% | 5.7 ms |
2606:50c0:8001::153 |
IPv6 | — |
2606:50c0:8001::/48
|
US | — | AS54113 Fastly, Inc. | Clean | 2026-04-19 17:39 | 2026-04-22 10:01 | 8 | 0 | 100.0% | 4.9 ms |
2606:50c0:8000::153 |
IPv6 | — |
2606:50c0:8000::/48
|
US | — | AS54113 Fastly, Inc. | Clean | 2026-04-19 17:39 | 2026-04-22 10:01 | 8 | 0 | 100.0% | 2.9 ms |
185.199.108.153 |
IPv4 |
cdn-185-199-108-153.github.com
|
185.199.108.0/24
|
US | — | AS54113 Fastly, Inc. | Clean | 2026-04-19 17:39 | 2026-04-22 10:01 | 8 | 0 | 100.0% | 3.5 ms |
185.199.109.153 |
IPv4 |
cdn-185-199-109-153.github.com
|
185.199.109.0/24
|
US | — | AS54113 Fastly, Inc. | Clean | 2026-04-19 17:39 | 2026-04-22 10:01 | 8 | 0 | 100.0% | 3.7 ms |
185.199.110.153 |
IPv4 |
cdn-185-199-110-153.github.com
|
185.199.110.0/24
|
US | — | AS54113 Fastly, Inc. | Clean | 2026-04-19 17:39 | 2026-04-22 10:01 | 8 | 0 | 100.0% | 4.5 ms |
185.199.111.153 |
IPv4 |
cdn-185-199-111-153.github.com
|
185.199.111.0/24
|
US | — | AS54113 Fastly, Inc. | Clean | 2026-04-19 17:39 | 2026-04-22 10:01 | 8 | 0 | 100.0% | 4.1 ms |
Technology
Technology Stack
8 detected
HTTP/2
HTTP/3 (QUIC)
8
Technologies
API
1
Public CORS API
CORS wildcard origin
CDN
1
X-Served-By header
Cache
2
Library
1
Parallax.js
Parallax effect
Platform
1
X-GitHub-Request-Id header
Technology Provider
1 tech · 1 sites
This domain provides technology used by other monitored sites.
Sapper
Discovery
Discovered Sub-domains
1
Certificate Transparency
1
| Subdomain | Source | Status | Code | Response | IPs | Last Checked |
|---|---|---|---|---|---|---|
ru.sapper.svelte.dev |
Certificate Transparency | Pending | — | — | — | Never |