Category
Routing & BGP
ASNs, AS paths, BGP communities, route aggregation, and routing protocol helpers.
AS_PATH Parser
Parse BGP AS_PATH text, flag legacy set segments deprecated by RFC 9774, and calculate its decision-process path length.
ASN Formatter
Convert 32-bit autonomous system numbers between AS-prefixed, asplain, asdot, and asdot+ notation.
BGP Community Parser
Parse standard 32-bit BGP communities from ASN:value, decimal, hexadecimal, or well-known names.
BGP Large Community Parser
Parse RFC 8092 BGP Large Communities into their three unsigned 32-bit fields.
HSRP Helper
Derive the HSRP virtual MAC, hello multicast address, and UDP port for version 1 or 2, IPv4 or IPv6, and check the group and timers.
IP Prefix Comparison
Compare two IPv4 or IPv6 prefixes for equality, containment, disjointness, and their smallest common covering prefix.
IPv4 / IPv6 Route Aggregator
Aggregate mixed IPv4 and IPv6 prefixes into the smallest exactly equivalent route sets for each address family.
IS-IS NET Generator
Assemble an IS-IS NET (N-selector 0x00) from an area address and a 6-octet system ID, entered directly or derived from an IPv4 address.
IS-IS NET Parser
Split an IS-IS NET / NSAP into its AFI, area address, 6-octet system ID, and N-selector, with length and NET validity checks.
Longest Prefix Match Visualizer
Visualize which IPv4 or IPv6 routes contain an address and highlight every equally specific longest-prefix match.
MPLS Label Decoder
Decode or build a 32-bit MPLS label stack entry: 20-bit label, Traffic Class (TC/EXP), bottom-of-stack bit, and TTL, with reserved-label names.
OSPF Area ID Converter
Convert an OSPF area ID between its 32-bit decimal value and the dotted-decimal a.b.c.d form, with hex and binary views.
OSPF Cost Calculator
Compute an OSPF interface cost from a reference bandwidth and interface bandwidth, clamped to the 16-bit metric range.
OSPF Wildcard Mask Helper
Convert between a prefix length / subnet mask and an OSPF wildcard (inverse) mask, and build the network statement for an address.
Private ASN Detector
Identify RFC 6996 private-use ASNs and distinguish documentation, transitional, reserved, and other numeric ranges.
RPKI Validation State Explainer
Explain the RFC 6811 Valid, Invalid, and NotFound origin-validation states and their operational limits offline.
VRRP Priority & Timer Helper
Work out VRRP priority, Skew_Time, the down interval, and the virtual MAC for VRRPv3 (RFC 9568) and the historical VRRPv2 (RFC 3768).