MB Networks
Topic
Networking tools
IP addressing, subnetting, VLANs, DNS, and network reference tools. 8 free tools, browser-based, no sign-up.
All networking tools
CIDR Aggregator
Paste a list of IP addresses or CIDR blocks and get the minimal set of CIDR ranges that covers them all. Useful for firewall ACLs and route summarization.
Open →IPv4 Subnet Calculator
Enter any IPv4 address and prefix length to instantly see network address, broadcast, usable hosts, subnet mask, wildcard mask, and a bit-level breakdown. Works for any /0–/32.
Open →VLAN / Subnet Planner
Enter a parent network block and the number of subnets needed — get a ready-to-use VLAN table with network addresses, usable hosts, and gateway suggestions.
Open →DNS Lookup
Look up DNS records, domain registration (RDAP/WHOIS), and IP geolocation for any domain or IP address. No install, no sign-up.
Open →HTTP Status Code Reference
Searchable HTTP status code reference with descriptions, common causes, and usage notes. Filter by category: 2xx, 3xx, 4xx, 5xx.
Open →MAC Address Vendor Lookup
Look up the manufacturer of any network device by MAC address. Queries the IEEE OUI database to identify the vendor from the first 3 octets.
Open →PoE Budget Calculator
Add your PoE devices and check total draw against your switch's power budget — with common PoE class presets for APs, cameras, and phones.
Open →Port Number Reference
Searchable reference of well-known TCP and UDP port numbers with service names and descriptions. Filter by protocol or port range.
Open →