Traceroute Tool: Free TCP Port 443 Check

This traceroute tool page checks whether a public host or domain accepts a TCP connection on port 443 and shows the resolved IP address, hostname and connection time in milliseconds. It suits site owners and admins who need a fast reachability check. It does not list router hops, so this guide also shows how to run a full traceroute yourself.

What Is Traceroute, and What Does This Page Check?

Traceroute is a network diagnostic that maps the routers (hops) a packet crosses on its way to a destination. It works by sending packets with a rising Time to Live (TTL) value. Each router lowers the TTL by one, and the router that reaches zero reports back, which reveals its address and how long the round trip took.

The page you are on does something narrower. It resolves the host you enter, opens one TCP connection to port 443 (the standard HTTPS port) and reports how long that connection took to open. You get a quick answer to a practical question: does this public host accept HTTPS connections right now, and how fast?

That makes it a connectivity and response-time check, not a hop-by-hop path trace. The difference matters when you read the results, and the limitations section below spells it out.

How to Use the Traceroute Tool

You need only a hostname or an IP address, and the check takes a few seconds. Follow these steps:

1. Type a domain or public IP address into the Host or Domain field, for example example.com or 93.184.216.34.
2. If you paste a full web address that starts with http or https, the tool uses only the host part and ignores the path.
3. Click Check connectivity. The button changes to "Checking connectivity..." while the test runs.
4. Read the heading that starts with TCP connection to. It repeats your host and shows the IP address it resolved to in parentheses.
5. Check the results table: Port, IP Address, Hostname and Connection time.
6. If an error appears instead, read the message, correct the input or the host, and run the check again.

How to Traceroute on Windows, Mac and Linux

To see every hop between your own device and a website, run the traceroute command built into your operating system. Each system includes one, and the output lists a hop number, up to three round-trip times and the router address.

Windows (Command Prompt)

Open Command Prompt and type tracert example.com. Add -6 to force IPv6 or -d to skip hostname lookups, which makes the trace finish faster. For an IP address, use the same command with the address in place of the domain.

macOS and Linux (Terminal)

Open Terminal and type traceroute example.com. On Linux, traceroute -T -p 443 example.com sends TCP packets to port 443 instead of the default probes, which helps when a network filters the default ones. That TCP mode usually needs administrator rights. Use traceroute -6 for IPv6.

Other platforms

Many routers, firewalls and phone apps include a traceroute or trace function with similar output. The reading rules are the same on all of them: look for where the delay jumps and where replies stop.

Worked Example: Checking example.com

Say you type example.com and click the button. The tool resolves the domain to an address such as 93.184.216.34 and attempts a connection on port 443. A typical result looks like this (the numbers are illustrative):

• Port: 443
• IP Address: 93.184.216.34
• Hostname: example.com
• Connection time: 28.4 ms

This tells you three things. The domain resolves to a public address, the host accepts HTTPS connections, and opening that connection took about 28 milliseconds. If you had entered the IP address instead of the domain, the Hostname column would show a dash because there is no separate name to display.

One reading is a snapshot, so run the check two or three times. If you see 28 ms, 31 ms and 26 ms, the host is stable. If you see 28 ms, 240 ms and 31 ms, something is intermittently slow, such as a busy origin or a congested route.

How to Read the Results and Fix Problems

A successful row means the host answered on port 443. The connection time is how long it took to establish that TCP connection, so it mostly reflects distance and network conditions between the tool and the host. As a rough rule of thumb, a few tens of milliseconds is typical for a nearby host, 100 to 300 ms is common across continents, and consistently higher values deserve a closer look.

When the check times out

The message says port 443 did not accept a connection within three seconds, and it states that this does not prove the host is offline. A server can be up while HTTPS is disabled, the certificate service is stopped, or a firewall drops traffic to port 443. Confirm that the site serves HTTPS, review firewall and security group rules, and compare with the address returned by a DNS lookup to make sure the domain points where you expect.

When the host is rejected

Private, loopback and reserved ranges (such as 192.168.x.x or 10.x.x.x) are blocked, and so are names that do not resolve to a public address. Check the domain for typos first. If you recently changed DNS, the new record may not have reached every resolver yet, which a DNS propagation checker can confirm.

Who Should Use This Check, and When

It fits any situation where you need to know quickly whether a public host is accepting HTTPS connections. Here are some concrete cases:

• Site owners: your site loads for you but a customer says it does not. Check whether port 443 answers from outside your network.
• After a migration: you moved hosting and want to confirm the new IP accepts HTTPS before you cut over traffic.
• Developers and sysadmins: you suspect a firewall change closed port 443 on a staging or production host.
• SEO work: Google needs your pages to be reachable over HTTPS to crawl them, so a failed connection is worth ruling out when pages drop out of reports.
• Hosting comparison: run the check on several hosts and compare connection times as one rough input.

Best Practices and Common Mistakes

Good habits make this check far more informative. A few specific ones:

• Enter the bare host. Use example.com, not a page path or query string. Paths are discarded anyway.
• Test the right name. The www and non-www versions can point to different servers, so test both if you manage both.
• Repeat the test. Take at least three readings before drawing a conclusion about speed.
• Do not treat a timeout as proof of an outage. Verify with a browser, your hosting dashboard or your monitoring.
• Do not expect a hop list. If you need to find where packets are delayed or dropped, use the tracert or traceroute command from your own machine.

To learn more about the address you tested, run the domain to IP lookup for its country and ISP, or the ASN lookup to see which network operates it. If you want the DNS side, an A record lookup shows the IPv4 addresses the domain publishes.

Limitations and Accuracy Notes

This check makes one connection attempt to one port, port 443. You cannot choose a different port, and it does not discover routers along the way, measure ICMP latency, or report packet loss. The timing reflects the connection from the tool to the host, not from your own device, so it can differ from what you see at home or in the office.

A single connection time is also a point-in-time sample. Treat it as a quick health signal, and use a full traceroute or ongoing monitoring when you need to diagnose a route problem in detail.

Enter a domain or public IP in the field above and click Check connectivity to see whether it accepts HTTPS connections and how quickly. For more diagnostics, browse the Network and IP tools collection.