🔧 Tech Tools

— · —

🌐 Public IP & Location

IPv4…
IPv6…
ISP / Org…
ASN…
City…
Region…
Country…
Postal…
Lat / Lon…
Reverse DNS…

🏠 Local Network (this device)

Local IPsdetecting…
Effective Type—
Downlink—
RTT (browser)—
Save-Data—

Local IPs detected via WebRTC. Some browsers (Safari, Brave with shields) may hide this.

📡 Connectivity Test

Browsers can't send true ICMP. These are HTTPS handshake round-trips to each target — useful as a "is the path working?" signal.

TargetHostResult

⚡ Quick Speed Test

Download— Mbps
Size—
Duration—

Downloads a Cloudflare test file. Rough estimate only.

🔍 DNS Lookup

Resolver: Cloudflare 1.1.1.1 (DoH)

🧮 Subnet Calculator

💻 Browser & Device

Browser—
OS—
Platform—
Languages—
Screen—
Viewport—
Pixel Ratio—
Cookies—
User Agent—

📋 Quick Reference

T568A / T568B color order
PinT568AT568B
1White/GreenWhite/Orange
2GreenOrange
3White/OrangeWhite/Green
4BlueBlue
5White/BlueWhite/Blue
6OrangeGreen
7White/BrownWhite/Brown
8BrownBrown

Straight-through: same on both ends (B-B most common). Crossover: A on one end, B on the other.

Common ports
PortService
20/21FTP
22SSH / SFTP
23Telnet
25SMTP
53DNS
67/68DHCP
69TFTP
80HTTP
110POP3
123NTP
143IMAP
161/162SNMP
389LDAP
443HTTPS
445SMB
465 / 587SMTPS / Submission
514Syslog
636LDAPS
993IMAPS
995POP3S
1433MSSQL
3306MySQL
3389RDP
5432PostgreSQL
5900VNC
8080 / 8443HTTP-alt / HTTPS-alt
CIDR ↔ Subnet Mask
CIDRSubnet MaskWildcardUsable Hosts
/30255.255.255.2520.0.0.32
/29255.255.255.2480.0.0.76
/28255.255.255.2400.0.0.1514
/27255.255.255.2240.0.0.3130
/26255.255.255.1920.0.0.6362
/25255.255.255.1280.0.0.127126
/24255.255.255.00.0.0.255254
/23255.255.254.00.0.1.255510
/22255.255.252.00.0.3.2551,022
/21255.255.248.00.0.7.2552,046
/20255.255.240.00.0.15.2554,094
/19255.255.224.00.0.31.2558,190
/18255.255.192.00.0.63.25516,382
/17255.255.128.00.0.127.25532,766
/16255.255.0.00.0.255.25565,534
/15255.254.0.00.1.255.255131,070
/14255.252.0.00.3.255.255262,142
/13255.248.0.00.7.255.255524,286
/12255.240.0.00.15.255.2551,048,574
/8255.0.0.00.255.255.25516,777,214

/31 & /32 are special: /31 is 2 addrs used for point-to-point links (RFC 3021), /32 is a single host.

RFC1918 private ranges
RangeCIDRHosts
10.0.0.0 – 10.255.255.25510.0.0.0/8~16.7M
172.16.0.0 – 172.31.255.255172.16.0.0/12~1M
192.168.0.0 – 192.168.255.255192.168.0.0/16~65K
169.254.0.0 – 169.254.255.255169.254.0.0/16APIPA (link-local)
100.64.0.0 – 100.127.255.255100.64.0.0/10CGNAT
Common public DNS
ProviderPrimarySecondary
Cloudflare1.1.1.11.0.0.1
Google8.8.8.88.8.4.4
Quad99.9.9.9149.112.112.112
OpenDNS208.67.222.222208.67.220.220
Cloudflare (family)1.1.1.31.0.0.3