THE PASTEZAP TOOLKIT
Network & IT Infrastructure
Plan IPv4 and IPv6 subnets, size servers, bandwidth, firewalls, RAID, UPS and PoE, and generate firewall, DHCP, VLAN, TLS and WireGuard configurations in your browser.
Choose from 43 focused tools. Each page shows supported formats, practical examples and input limits before you begin. No account is required.
43 tools
Subnet Calculator (IPv4 & IPv6)
Calculate network, broadcast, host range, mask, wildcard and usable hosts for any IPv4 or IPv6 prefix, and split it into smaller subnets.
TCP/UDP Port Lookup
Search common TCP and UDP port numbers by number, service or category, with security notes on which services should never face the internet.
RAID Calculator
Calculate usable capacity, efficiency, fault tolerance, IOPS, throughput and rebuild time for RAID 0, 1, 5, 6, 10, 50, 60 and ZFS RAIDZ.
IP Address Converter
Convert an IP address between dotted decimal, integer, hexadecimal, binary, IPv4-mapped IPv6 and reverse-DNS forms, and expand or compress IPv6.
Subnet Mask Calculator
Convert between CIDR prefix, subnet mask and wildcard mask, find the smallest mask for a number of hosts, and browse the full /0โ/32 table.
UPS Sizing Calculator
Size a UPS from your equipment: VA and watt rating with headroom, battery energy for the runtime you need, input current and heat.
Network Bandwidth Calculator
Work out the download and upload bandwidth an office or site needs from its users and applications, with headroom and a recommended link.
Uptime & SLA Calculator
Convert an availability percentage into allowed downtime, and estimate the availability of a system from its components and redundancy.
Website Server Sizing Calculator
Estimate peak traffic, concurrent visitors, requests per second, bandwidth and the CPU and RAM a server needs from your monthly website visitors.
WireGuard Config Generator
Generate WireGuard server and client configurations with keys created in your browser, IPv4/IPv6 addressing, full or split tunnel and QR codes.
Firewall Rule Generator
Write firewall rules once and generate iptables, nftables, UFW, firewalld, Windows Defender Firewall, Cisco ACL and MikroTik configurations.
VLSM Subnet Calculator
Divide an IPv4 block into variable-size subnets from the number of hosts each one needs, with a full allocation table and free space.
PoE Budget Calculator
Check a switchโs PoE budget against cameras, access points and phones by IEEE class, port standard (802.3af/at/bt) and actual draw.
Cloud Cost Calculator
Estimate monthly and yearly cloud costs for compute, storage, data transfer and other items from prices you enter, for any provider and currency.
TCP Throughput & Latency Calculator
Calculate the bandwidth-delay product, the TCP window needed and the throughput limited by window size, latency and packet loss.
IP Range to CIDR Converter
Convert IP ranges, address lists and overlapping blocks into the smallest set of CIDR blocks, with exclusions and a covering supernet.
MAC Address Generator
Generate locally administered, unicast MAC addresses for test configurations.
IPv4 to IPv6 Mapped Address
Convert a canonical IPv4 address to IPv4-mapped IPv6 notation.
IP in Subnet Checker
Check whether a list of IP addresses belongs to one or more networks, with the most specific matching block for each address.
IPv6 Subnet Planner
Plan an IPv6 prefix across sites: allocate nibble-aligned site prefixes from the number of /64 networks each needs and list every /64.
Reverse DNS Zone Generator
Generate in-addr.arpa and ip6.arpa reverse DNS zone files with SOA, NS and PTR records from a list of addresses and host names.
VLAN Planner
Plan VLAN IDs, subnets, gateways and DHCP pools, check them for mistakes and generate Cisco, Linux, Netplan and MikroTik configuration.
DHCP Config Generator
Generate DHCPv4 server configuration for Kea, ISC dhcpd, dnsmasq, Windows Server and MikroTik, with pools, options and reservations.
MTU & MSS Calculator
Calculate the usable MTU and TCP MSS through PPPoE, MPLS, WireGuard, IPsec, GRE, VXLAN and other tunnels, with clamping commands.
Firewall Sizing Calculator
Size a next-generation firewall: the threat-protection, TLS-inspection and VPN throughput, sessions and connection rate to compare with vendor datasheets.
Wi-Fi Access Point Calculator
Estimate how many Wi-Fi access points a space needs for coverage, throughput and device count, with PoE and switch-port hints.
Virtualization Host Sizing Calculator
Size hypervisor hosts for your virtual machines from vCPU-to-core ratio, memory, reserved resources and N+1 or N+2 redundancy.
VoIP Bandwidth Calculator
Calculate the bandwidth of VoIP calls for G.711, G.722, G.729, G.723.1, iLBC and Opus with real packet headers, VLANs, cRTP and VPN overhead.
Erlang B & C Calculator
Find the phone lines or trunks needed for a blocking target (Erlang B) or the call-centre agents needed for a service level (Erlang C).
Video Streaming Bandwidth Calculator
Estimate peak delivery bandwidth, monthly data and CDN cost for live or on-demand video from viewers and an adaptive bitrate ladder.
Storage IOPS Calculator
Find how many drives a workload needs from its IOPS, read/write mix and RAID write penalty, and compare HDDs, SATA SSDs and NVMe.
Log & SIEM Storage Calculator
Estimate events per second, daily log volume and hot and archive storage for a SIEM or log platform from your log sources.
Database Size Calculator
Estimate database size now and after months of growth from tables, rows, row and index sizes, overhead, replicas and free space.
Server Rack Planner
Plan rack space, power and cooling: rack units, racks needed, kW per rack, circuits for A+B feeds, BTU/h and weight.
Backup Storage Calculator
Estimate backup storage from data size, change rate, growth, backup scheme, GFS retention, deduplication and off-site copies.
Fiber Optic Loss Budget Calculator
Calculate optical link loss from fibre length, connectors, splices and splitters, and check it against the transceiver power budget.
Network Cable Calculator
Estimate Ethernet cable boxes, total length, jacks, patch panels and patch cords for a structured cabling job, with length checks.
Radio Link Budget Calculator
Calculate free-space path loss, received signal, fade margin, Fresnel zone clearance and earth bulge for point-to-point wireless links.
Data Centre Power & PUE Calculator
Calculate facility power, yearly energy, electricity cost, COโ emissions and cooling load from IT load and PUE.
SSD Endurance Calculator (TBW & DWPD)
Convert SSD endurance between TBW and DWPD and estimate how many years a drive lasts at your daily write volume.
Firewall Rule Analyzer
Audit iptables-save output or Cisco ACLs for shadowed and redundant rules, catch-all permits, internet-exposed services and risky default policies.
HTTP Security Headers Generator
Build Content-Security-Policy, HSTS, Referrer-Policy, Permissions-Policy and cross-origin headers for Nginx, Apache, Caddy, IIS, _headers and Express.
TLS / SSL Config Generator
Generate secure HTTPS configuration for Nginx, Apache, HAProxy and Caddy: TLS 1.2/1.3, forward-secret ciphers, HSTS, HTTP/2 and HTTP/3.