37 articles
Knowledge Base
Network Tools
37 articles in the Network Tools category · page 2 of 2.
- MX Diagnostics — one tool that tells you whether your inbound mail path is actually reachable A practical look at the PortJar MX Diagnostics tool — how it resolves MX, forward-resolves each host, checks PTR, and probes SMTP ports, and how to read the combined output when inbound mail is failing.
- Password & API Key Generator — when you need a real random secret right now A walkthrough of PortJar's Password & API Key Generator — why CSPRNG matters, when to use a long password vs an API key, and how to deliver it without leaking it in Slack.
- Public / Private IP Checker — settling what kind of address you are actually looking at A walkthrough of the PortJar Public / Private IP Checker — when to use it, what RFC 1918, loopback, link-local, and reserved ranges actually mean, and how the classification changes the troubleshooting next step.
- Redirect Tracer — seeing every hop a URL actually takes A practical guide to PortJar's Redirect Tracer — when to use it, how to read the hop list, and how to catch unwanted vendor redirects, broken canonicals, and chains that compound latency.
- Regex Tester — proving a pattern matches what you think it matches A walkthrough of PortJar's Regex Tester — how to iterate on a JavaScript-flavored pattern, read capture groups, and avoid the three common mistakes that ship broken regexes to production.
- Reverse DNS (PTR) Lookup — confirming forward-confirm for mail and logs PortJar's Reverse DNS tool resolves an IP to its PTR record and then forward-resolves the result to confirm the mapping is bidirectional — the exact check Gmail and Outlook run on incoming SMTP.
- SPF Lookup & Parser — reading an SPF record without counting in your head PortJar's SPF Lookup & Parser fetches the v=spf1 record, breaks down every mechanism and include, counts DNS lookups against the RFC 7208 limit, and flags the catch-all policy.
- SSL/TLS Certificate Checker — confirming what the server is actually serving A walkthrough of PortJar's SSL/TLS Certificate Checker — when to use it, how to read expiry and chain trust, and which TLS findings turn into outages if ignored.
- Subnet Splitter — carving a CIDR into the blocks you actually need A walkthrough of the PortJar Subnet Splitter — when to reach for it, how to pick the right child prefix, and how to use the per-subnet output for VPC layouts and tenant allocations.
- TCP Port Check — confirming a port is actually reachable end-to-end A walkthrough of PortJar's TCP Port Check — when it gives the right answer, how to read open vs. closed vs. filtered, and why a banner grab settles arguments faster than a screenshot.
- URL Encoder / Decoder — getting percent-encoding right the first time A practical guide to PortJar's URL Encoder / Decoder — when to encode, when to decode, and why eyeballing percent-encoding by hand is how production endpoints get broken.
- URL Parser — breaking a URL into the parts that actually matter A practical look at PortJar's URL Parser — when to use it, why guessing at a URL's components is a recipe for bugs, and how to read the structured breakdown.
- What's My IP — confirming the public address you're actually leaving from A practical look at the PortJar What's My IP tool — when to use it, why the address differs from ipconfig, and how the IPv4/IPv6 and ASN context help diagnose real network problems.