Your connection
What websites can see about your connection right now.
Looking up your connection…
Internet speed test
Measures latency, download and upload against Cloudflare’s nearest edge. Close other downloads for the most accurate result.
- Ping
- —ms
- Jitter
- —ms
- Download
- —Mbps
- Upload
- —Mbps
IP address lookup
Find the location, ISP and network of any IPv4 or IPv6 address.
WHOIS / RDAP lookup
Registration details for a domain, IP address or AS number, from the official registry RDAP servers.
DNS lookup
Query live DNS records over HTTPS.
Reverse DNS
Find the hostname (PTR record) assigned to an IP address. Mail servers usually need one.
ASN lookup
See who operates a network and which IP ranges it announces. Enter an AS number or an IP address.
SIP port check
Our server sends a real SIP OPTIONS request to the address and port you choose, then reports whether a SIP service answers. Leave the address empty to test your own connection.
Blacklist check
Checks an IPv4 address against public spam blocklists (DNSBLs). A listing can stop your mail from being delivered.
Subnet calculator
Enter an IPv4 address with a prefix, like 192.168.1.10/24, or with a mask, like 10.0.0.1 255.255.252.0.
VPN and proxy check
Find out whether an IP address belongs to a VPN, proxy, Tor exit node or data center, or to a regular home or business connection.
WebRTC leak test
Video-call technology in your browser can reveal your real IP even when a VPN is on. This test shows exactly what it exposes.
Browser info
What your browser shares with every website you visit.
Network and security news
The latest stories on cybersecurity, networking and the internet, gathered from trusted publishers. A fresh mix loads every visit.
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