the network toolbox
A one-stop shop for network testing. DNS, TLS, HTTP and subnet tools for people who live in a terminal. Free, no signup, no tracking.
$iplookup
IP lookup: geolocation, ASN, prefix, rDNS, RDAP
ip$myip
What is my IP address and request headers
ip$ping
Ping from the server: ICMP or TCP, 1-20 packets
ip$port
TCP port reachability check (common ports)
ip$whois
WHOIS / RDAP lookup for domains, IPs and ASNs
ip$mac
MAC address vendor lookup: IEEE database, bulk, notation converter
ip$ports
Port and service reference: 100+ well-known TCP/UDP ports
ip$mtu
Path MTU discovery (DF ping binary search) and MSS calculator
ip$cidr
Subnet / CIDR calculator: linked masks, split, route aggregation
ip$trace
Traceroute: ICMP, TCP or UDP probes with per-hop latency, rDNS, ASN
ip$mtr
MTR: per-hop loss and latency over many rounds (ICMP, TCP or UDP)
ip$speed
Browser speed test: latency, jitter, download, upload
dns$dns
DNS lookup: A, AAAA, MX, NS, TXT, CNAME, SOA, CAA
dns$ptr
Reverse DNS (PTR) bulk lookup with forward-confirmation
dns$dnsprop
DNS propagation: compare answers from 14 public resolvers
dns$mailauth
SPF / DKIM / DMARC checker
dns$blacklist
DNSBL check: is an IP on spam/abuse blocklists?
web$ssl
TLS certificate checker: chain, expiry, SANs, trust
web$headers
HTTP response headers and redirect chain
web$httpver
HTTP/1.1, HTTP/2 and HTTP/3 tester: redirects, HSTS, compression, timing
web$ua
What is my browser: user agent, OS, screen, version check
web$html5
HTML5 / browser feature test: APIs, media codecs, CSS, JS
sec$tlsscan
TLS scanner: protocol versions, every accepted cipher suite, certificate checks
sec$sechdr
Security-headers grader: HSTS, CSP, cookies, more
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