Subnet math, DNS lookups, DHCP options, and certificate checks share one browser tab in Networking Toolbox, a free toolkit for sysadmins and network engineers. Need to carve a /24 into departments? The VLSM planner fits named subnet requirements into a parent block, reports each subnet's efficiency and the leftover space, and exports the plan as CSV or JSON. Merging address lists? CIDR utilities summarize, split, compare, and deaggregate prefixes, with set operations for difference, overlap, and containment. Writing configs? Generators build DHCPv4 and DHCPv6 options, PXE profiles, Kea or ISC snippets, and SPF, DKIM, DMARC, CAA, TLSA, and SRV records, and DNSSEC helpers calculate key tags and DS records. Something broken? Diagnostics query DNS through Cloudflare, Google, Quad9, OpenDNS, or a resolver of your choice, read TLS certificate chains, grade HTTP security headers, trace redirects, check TCP ports, look up BGP routes and RDAP records, and test mail servers. Need a refresher? Reference guides explain private ranges, CGNAT, IPv6 address types, and common ports. A keyboard search palette puts any tool a few keystrokes away, and bookmarked tools stay available offline. Eighteen themes, four languages, custom branding, and accessibility switches make it feel like your own, and a keyless JSON API serves the subnet, CIDR, IP, and DNS utilities to scripts. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.

SpatiumDDI is the open alternative to commercial DDI platforms that charge by the IP, by the appliance, and by the feature, then lock every zone and subnet you own inside a renewal cycle. It does not just render configuration for servers somebody else runs, but deploys and operates BIND9, PowerDNS, Technitium, and Kea itself. Manage zones and records with per-server sync state, hand out DHCP scopes, pools, and static reservations per server group, and watch live leases reported back by the Kea agents. The IPAM side keeps spaces, blocks, and subnets in a tree with per-address DNS and DHCP sync, while the dashboard shows utilization, capacity, and platform health at a glance. Bring an existing estate with you through importers for BIND, Windows, PowerDNS, Technitium, Kea, ISC, and NetBox, and manage Windows DNS and DHCP agentlessly over WinRM when a full cutover is not on the table. Delegate safely with group-based roles over LDAP, OIDC, SAML, RADIUS, or TACACS+, search every object globally, and keep an append-only audit log of who changed what. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. Apache 2.0 licensed.