IPv6 Multicast Decoder¶
The IPv6 multicast scope decoder is the front-door tool for the v3.6.0
multicast theme. It accepts any IPv6 address in the FF00::/8 multicast
range and decodes it into:
- Scope (1..15) and human-readable name (
interface-local,link-local,admin-local,site-local,organization-local,global, orreserved) per RFC 4291 §2.7 and RFC 7346. - Flags (4 bits, layout
0RPT) with booleans fortransient(T),prefix_based(P, RFC 3306), andembedded_rp(R, RFC 3956). - Scheme hint — one of
well-known,transient,ssm,embedded-rp, orreserved. - Group ID — the lower 112 bits as a 28-character hex string.
- Well-known group lookup — for the small set of named groups that ship with this tool (FF02::1, FF02::2, FF02::5/6 OSPF, FF02::9 RIP, FF02::a EIGRP, FF02::d All-PIM, FF02::16 MLDv2, FF05::101 NTP, plus the FF02::1:FF**:**** Solicited-Node family).
- Deep-link to the per-scheme tool (the SSM and embedded-RP drawers ship in v3.6.0 T3 and T4 respectively).
Examples¶
Well-known group (All Nodes)¶
Input: FF02::1
| Field | Value |
|---|---|
| Scope | 2 (link-local) |
| Flags | 0b0000 (R=0 P=0 T=0) |
| Scheme | well-known |
| Well-known | All Nodes Address (RFC 4291) |
| Detail route | none |
SSM group (RFC 3306)¶
Input: FF3E::1234:5678
| Field | Value |
|---|---|
| Scope | 14 (global) |
| Flags | 0b0011 (R=0 P=1 T=1) |
| Scheme | ssm |
| Well-known | not matched |
| Detail route | /ipv6/ssm |
The P flag indicates a prefix-based / SSM group; the decoder offers a deep-link to the SSM tool drawer.
Embedded-RP group (RFC 3956)¶
Input: FF7E:140:2001:db8:cafe::1234
| Field | Value |
|---|---|
| Scope | 14 (global) |
| Flags | 0b0111 (R=1 P=1 T=1) |
| Scheme | embedded-rp |
| Detail route | /ipv6/embedded-rp |
The R flag (set together with P+T) signals an embedded-RP group; the decoder deep-links to the embedded-RP tool.
Reserved scope¶
Input: FF00::1
| Field | Value |
|---|---|
| Scope | 0 (reserved) |
| Scheme | well-known (no registry match) |
Scope 0 is reserved per RFC 4291 §2.7. The decoder still returns the canonical address and group ID for inspection.
REST API¶
POST /api/v1/multicast6 — see the OpenAPI spec for the full schema and
worked examples for each scheme.
Shareable URLs¶
The decoder participates in the standard shareable-URL pattern:
?multicast6_input=FF02::1 on the IPv6 tab pre-fills the input and
runs the decoder on page load.