1.\" $KAME: ifmcstat.8,v 1.6 2002/10/31 04:23:43 suz Exp $ 2.\" 3.\" Copyright (c) 2007-2009 Bruce Simpson. 4.\" Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project. 5.\" All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the project nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.Dd March 18, 2026 32.Dt IFMCSTAT 8 33.Os 34.Sh NAME 35.Nm ifmcstat 36.Nd dump multicast group management statistics per interface 37.Sh SYNOPSIS 38.Nm 39.Op Fl i Ar interface 40.Op Fl f Ar address-family 41.Op Fl v 42.Op Fl K 43.Op Fl M Ar core 44.Op Fl N Ar system 45.\" 46.Sh DESCRIPTION 47The 48.Nm 49command dumps multicast group information from the kernel. 50.Pp 51The following options are supported: 52.Bl -tag -width Fl 53.It Fl i Ar interface 54specifies the interface to be displayed. 55.It Fl f Ar address-family 56specifies the address family to be displayed; 57.Ar inet , 58.Ar inet6 59and 60.Ar link 61are supported. 62.It Fl v 63specifies that link-layer memberships should be printed; 64they are suppressed by default. 65It may not be specified for 66.Fl f Ar link . 67Source lists for each group will also be printed. 68.El 69.Sh IMPLEMENTATION NOTES 70.Nm 71will always print the embedded scope IDs of IPv6 multicast group 72memberships. 73This is because memberships are always scoped to an interface. 74.Pp 75When run with the 76.Fl v 77option, 78.Nm 79may print multicast MAC addresses twice if they are 80referenced by a layer 3 protocol. 81.Sh SEE ALSO 82.Xr netstat 1 , 83.Xr getifaddrs 3 , 84.Xr getifmaddrs 3 , 85