IP Addressing

Find the IPv4 or IPv6 route that wins for a destination, with longest-prefix ranking, tie-break choices, and host-bit cleanup warnings.

Calculate IPv4 ACL wildcard masks from CIDR, subnet, host, or any entries, then review ACE lines, match size, overlaps, and broad matches.

Look up an ASN or public IP address, then compare RIPEstat routes, prefixes, RDAP contacts, PeeringDB context, and routing caveats.

Generate BGP prefix-list config from CIDR rows with Cisco, Arista, FRR, SONiC, and Junos syntax, normalization, and shadowing checks.

Review CIDR allowlists for broad source ranges, sensitive ports, stale dates, missing owners, overlaps, and scored cleanup evidence.

Plan a DHCP scope from subnet, pool, exclusions, reservations, growth, lease time, and utilization headroom before clients run short.

Check whether a DNS name changes under EDNS Client Subnet hints with no-hint controls, echoed scope, resolver signals, and exports.

Convert IPv4 addresses between dotted, decimal, hex, binary, octal, and mapped IPv6 forms with range labels and byte-order checks.

Check IPv4 ranges for CIDR overlaps, host-bit corrections, duplicate address counts, and coverage blocks before routing or peering changes.

Plan IPv4 subnet allocations from a parent CIDR, size each host request, and catch alignment gaps, fit issues, and headroom before rollout.

Plan IPv4 renumbering waves from host mappings, prefix boundaries, DNS TTL, and DHCP lease timing with readiness checks and rollback runbooks.

Plan IPv4 child subnets from a parent CIDR, size VLSM blocks from host demand, and check headroom, gaps, gateways, and overflow.

Summarize IPv4 CIDR lists into a single cover route or exact aggregate set, with gap exposure warnings, normalization, and exportable ledgers.

Normalize one IPv6 address into compressed and expanded forms, with prefix, zone, dotted IPv4 tail, hextet, binary, and reverse-DNS checks.

Calculate an IPv6 subnet from any address or CIDR, then review the canonical range, child-prefix capacity, reverse-DNS alignment, and EUI-64 samples.

Plan IPv6 site and LAN prefixes from a parent CIDR, then check capacity, /64 fit, nibble alignment, and copyable ledger rows.

Check a public IP, domain, or URL for approximate location, ASN, timezone, reverse DNS, map context, and follow-up network checks.

Calculate an IPv4 CIDR block from an address or mask, then check usable hosts, wildcard masks, split fit, and special-use warnings.

Split an IPv4 parent block into equal child CIDR ranges, compare usable hosts and gateway slots, and catch large-ledger or special-use warnings.

Generate reverse DNS zone text for an IPv4 CIDR block with PTR rows, SOA checks, RFC2317 parent records, and review-ready JSON.

Generate static route add, replace, and delete commands for Linux, Windows, Cisco-like, Junos, and firewall CLIs with route-row checks.

Plan IPv4 child subnets from a parent CIDR, compare usable host capacity with reserve, pack VLSM demand rows, and export address ledgers.

Plan IPv4 subnets from a parent CIDR, split or rejoin leaf blocks, and verify usable ranges, broadcasts, size maps, and exports.

Check your public IP address with IPv4/IPv6 detection, ASN, reverse DNS, provider consensus, and approximate location confidence.