Location
Nuremberg, Germany
Within about 20 km
Domain
salbut.net
Hosted by Hetzner Online in Nuremberg, Germany.
Still looking this up. This tab fills in as the answers arrive.
Network Every network on the internet has an autonomous system number (ASN). This is the one that announces this address.
AS24940Hetzner Online
Hetzner Online GmbH
BGP prefixPrefix The block of addresses this IP is announced in to the rest of the internet. RPKI valid means the block's owner signed off on the network announcing it.
RPKI valid213.133.96.0/19
Seen by 3,660 peers
Latency Round trip for an HTTPS request from your browser to the site and back, including the server's reply time.
Live— ms
Measuring from your browser…
At a glance
Route
Finding a probe near you…
Networks crossed
Each network is an autonomous system (AS). Your traffic is handed from one to the next where they connect, following
the routes BGP advertises.
- AS16509Anthropic, PBC
- AS24940Hetzner Online
Tracing from a probe near you with Globalping. Hop locations that its round-trip times rule out are left off the map.
DNS records
TypeNameValueTTL
Asalbut.net213.133.104.1542 hr
AAAAsalbut.net2a01:4f8:d0a:2113::22 hr
NSsalbut.netns1.your-server.de2 hr
NSsalbut.netns3.second-ns.de2 hr
NSsalbut.netns.second-ns.com2 hr
MXsalbut.net10 mail.protonmail.ch2 hr
MXsalbut.net20 mailsec.protonmail.ch2 hr
MXsalbut.net25 www154.your-server.de2 hr
TXTsalbut.net"v=spf1 include:_spf.protonmail.ch mx ~all"2 hr
TXTsalbut.net"protonmail-verification=5d4b8f984c70048ded936d4dce6e091f76b8a388"2 hr
Exposure
Open ports
12 open- 21FTP
- 22SSH
- 25SMTP
- 80HTTP
- 110POP3
- 143IMAP
- 222
- 443HTTPS
- 465SMTPS
- 587SMTP submission
- 993IMAPS
- 995POP3S
- Software
- PHP 8.3.35Apache HTTP ServerOpenSSH 9.2p1
- Tags
- STARTTLS
- Seen asHostnames Shodan has seen pointing at, or presented by, this address.
- aktive-schule-koeln.demail.frankfabry.dewww.aktive-schule-koeln.deyour-server.de+1 more
From Shodan InternetDB, updated weekly.
Details
Network
- IPv4
- 213.133.104.154
- Reverse DNSThe hostname this address points back to (its PTR record).
- www154.your-server.de
- ASNThe autonomous system number of the network that announces this address.
- AS24940
- Operator
- Hetzner Online GmbH
- PrefixThe block of addresses announced over BGP that contains this address.
- 213.133.96.0/19
- RPKIWhether a signed record (ROA) authorizes this network to announce this prefix.
- Valid
- VisibilityHow many bgp.tools peers carry this announcement.
- 3,660 peers
- Type
- Content
- Registry
- RIPE NCC
Location
- Country
- Germany
- Region
- Bavaria
- City
- Nuremberg
- Coordinates
- 49.4527° N, 11.0783° E
- Accuracy
- Within about 20 km
- Time zone
- Europe/BerlinUTC+2
- Local time
- 18:05
- Continent
- Europe
Registration
RDAP- Registrar
- Hetzner Online GmbH
- Registered
- Jun 17, 201214 years ago
- Expires
- Jun 17, 2027in 8 months
- Updated
- Jun 18, 2026
- StatusRegistry flags on the domain, such as locks that stop unauthorized transfers or changes.
- Active
- DNSSECDNSSEC signs DNS answers so they can't be forged on the way to you.
- Unsigned
- Name servers
- ns.second-ns.comns1.your-server.dens3.second-ns.de
- Registrant
- Redacted for privacy
Jun 17, 2012248 days leftJun 17, 2027
Partly protected
There's no DMARC policy, so each receiver decides for itself what to do with mail that fails salbut.net's SPF check.
- Receives mail
- Proton Mail
- Mail servers
- mail.protonmail.chmailsec.protonmail.chwww154.your-server.de
- SPFLists the servers allowed to send mail for the domain. Receivers check it against the sending server.
- Soft-fails everything else3 of 10 DNS lookups · includes _spf.protonmail.ch
- DMARCTells receivers what to do with mail that fails SPF and DKIM: nothing (none), spam folder (quarantine) or reject.
- Missing
- MTA-STSRequires other mail servers to use encrypted connections (TLS) when delivering to this domain.
- Not published
- TLS reportsAsks other mail servers to report failed encrypted deliveries (TLS-RPT).
- Not requested
- BIMIA brand logo that some mail apps show next to authenticated mail from the domain.
- Not published
HTTPS
Certificate
No unexpired certificate for this name is in Certificate Transparency logs.
From Certificate Transparency logs, via Cert Spotter.
Security
F- HSTSStrict-Transport-Security makes browsers refuse plain HTTP to this site. Preloaded sites are HTTPS-only even on a first visit.
- Not sent
- HTTP → HTTPSWhether the plain http:// address redirects visitors to the secure one.
- Doesn't redirect
- HTTP/3The newest HTTP, over QUIC. Announced in the alt-svc header or the domain's HTTPS DNS record.
- Not announced
- CAADNS records naming the only certificate authorities allowed to issue certificates for the domain.
- Any CA may issue
- security.txtA standard file (RFC 9116) telling security researchers how to report vulnerabilities.
- Not published
Security headers 2 of 7
- HSTSmissing
- CSPmissing
- Framingpresent
- No sniffingmissing
- Referrerpresent
- Permissionsmissing
- Isolationmissing
Response
526 <none>449 ms from CMH · 16 BDNS lookup234 ms
526 salbut.net449 ms
DNSConnect (TCP + TLS)Waiting for the replyFrom Cloudflare's CMH data center
Website
Page
526The front page answered 526, so there was nothing to read.
Built with
- CDN
- Cloudflarecf-ray header
Tech stack
The front page answered 526, so only what the response headers and cookies say is shown here.
Built with Each entry says what gave it away: a response header, a cookie's name, an asset's path or file name, or markup the tool leaves in the page. Versions are checked against endoflife.date's support schedules and, for JavaScript packages, OSV's vulnerability database, which carries GitHub's security advisories.
CDN & edge
- Cloudflare
cf-ray header
Response headers
- cache-control
- private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
- cf-ray
- a497585b6955a691-CMH
- connection
- close
- content-length
- 16
- content-type
- text/plain; charset=UTF-8
- date
- Mon, 12 Oct 2026 16:05:16 GMT
- expires
- Thu, 01 Jan 1970 00:00:01 GMT
- referrer-policy
- same-origin
- server
- cloudflare
- x-frame-options
- SAMEORIGIN
AI & agents
robots.txt is failing
robots.txt answers 526, and crawlers that follow the standard stay out of the whole site until it loads.
Crawlers
robots.txt failing (526)TrainingSearchOn request
They visit a page when someone asks an assistant about it. ChatGPT's, Perplexity's, Meta's and Amazon's treat robots.txt as advisory;
Anthropic's and Mistral's follow it.
OpenAIGPTBotblockedOAI-SearchBotblockedChatGPT-Userblocked
AnthropicClaudeBotblockedClaude-SearchBotblockedClaude-Userblocked
GoogleGoogle-ExtendedblockedGooglebotblocked—
Microsoft—bingbotblocked—
AppleApplebot-ExtendedblockedApplebotblocked—
Perplexity—PerplexityBotblockedPerplexity-Userblocked
MetaMeta-ExternalAgentblockedMeta-WebIndexerblockedMeta-ExternalFetcherblocked
AmazonAmazonbotblockedAmzn-SearchBotblockedAmzn-Userblocked
MistralMistralAI-TrainingblockedMistralAI-IndexblockedMistralAI-Userblocked
OthersCCBotblockedBytespiderblockedDuckAssistBotblocked
- Can cite itThe AI products that can use the site in their answers: each answers from one crawler (OAI-SearchBot for ChatGPT search, Googlebot for AI Overviews, bingbot for Copilot), and robots directives on the front page, like noindex, nosnippet and noarchive, keep some out.
- None
- Kept out of
- ChatGPT search: robots.txt isn't loading (526), so OAI-SearchBot stays outClaude: robots.txt isn't loading (526), so Claude-SearchBot stays outPerplexity: robots.txt isn't loading (526), so PerplexityBot stays outAI Overviews: robots.txt isn't loading (526), so Googlebot stays outGemini: robots.txt isn't loading (526), so Google-Extended stays outCopilot: robots.txt isn't loading (526), so bingbot stays outMeta AI: robots.txt isn't loading (526), so Meta-WebIndexer stays outSiri: robots.txt isn't loading (526), so Applebot stays out
Reading
- Without JavaScriptText on the front page before any scripts run: what GPTBot, ClaudeBot, PerplexityBot and most agents read. Google, Bing and Apple's crawlers run scripts.
- Page couldn't be read
- MarkdownAgents like Claude Code, Cursor and OpenCode ask for Markdown in their Accept header. It's the page without its markup, so it costs them far fewer tokens.
- Page couldn't be read
- llms.txtA Markdown file listing a site's key pages for AI tools. Coding agents read it; search crawlers mostly don't.
- Not published
- Structured dataschema.org JSON-LD in the page: facts about the site in a form machines read directly.
- Page couldn't be read
Tools Ways an AI agent can do things on the site, not just read it: an MCP server that apps like Claude, ChatGPT and Cursor connect to, an API catalog, packaged agent skills, a shopping profile (UCP), or tools the page offers AI in the browser (WebMCP). heade.rs looks in the official MCP Registry and the files the site publishes under /.well-known/.
No MCP server, API catalog, agent skills, shopping profile or in-page tools found.