AS204760 MOMIT MOMIT SRL

IPv6 prefix announced, but nothing inside is responding yet. AS204760 announces 1 IPv6 prefix(es) to the global routing table - that’s the part that BGP and our route-server scrape confirm. But our active discovery (curated hostnames, holder-derived domains, authoritative DNS NS/SOA/MX, certificate-transparency hostnames, RIPE Atlas, RDAP, IPv6 Hitlist) found no ICMPv6-responsive host inside the prefix on either vantage, and a yarrp pass against random addresses inside the prefix produced zero in-prefix hops (no router on the path through the AS replied with Time-Exceeded for any random target). That combination usually means the announcement is configured but the addresses inside aren’t in active use yet. The BGP route is there; the operational deployment is still ahead.

AS overview

Test target: 2a0c:9c80::1 · (no live host found) · address space: PA · prefixes announced: 1

prefix(es): 2a0c:9c80::/29

MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO peering

Not an MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO member, but our traceroute path crosses the MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO LAN from ITA host (Karsolink), SLO host (6connect) - reached via an MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO-resident transit operator.

RPKI & ASPA

1 of 1 prefix(es) covered by a valid ROA.

Prefix	RPKI state	Reason	Covering VRP(s)
`2a0c:9c80::/29`	✓ valid	matched VRP (correct origin, length within maxLength)	AS204760 /29 maxLen 48 (ripe)

Random-IP probe (yarrp) into the AS' prefixes

We probed 15 arbitrary IPv6 address(es) inside AS204760's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a07:2e80:0:302::1 at hop 24 - that router answers ICMPv6 Echo. This is not in AS204760's announced prefix; operationally it's the AS-edge / peering interface (often on an IXP peering address or an upstream's /127 link). The traceroute boundary is the AS edge: ICMPv6 Time-Exceeded responses from anything inside this AS are filtered.

ICMPv6 Type 2 (Packet Too Big) acceptance - active test

Type 2 active test inconclusive: no Echo Reply to 1300-byte probe.
method: ICMPv6 Echo + forged PTB, tested 2026-05-25T12:36:12Z

Failure detail — what to grep in your logs

vantage	our source	your target	method	result	tested (UTC)
go6lab	`2a00:8642:42::75`	`2a0c:9c80::1`	`icmp6-echo`	no_echo	2026-05-25T12:36:12Z
karsolink	`2a12:d8c0:105a:9001::a154`	`2a0c:9c80::1`	`icmp6-echo`	no_echo	2026-05-25T12:47:23Z
odin	`2607:fae0:a000::42`	`2a0c:9c80::1`	`icmp6-echo`	no_echo	2026-05-25T12:35:46Z

Attempt log (go6lab):

icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
dns-tcp → no_tcp: connect failed: [Errno 13] Permission denied
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (karsolink):

icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
dns-tcp → no_tcp: connect failed: [Errno 13] Permission denied
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (odin):

icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
dns-tcp → no_tcp: connect failed: [Errno 13] Permission denied
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

To match the corresponding ICMPv6 packet on your side (host firewall, AS edge, or transit tap), look for our PTBs around the timestamps above:

sudo tcpdump -i any -n -e 'icmp6 and ip6[40] = 2 and (src host 2607:fae0:a000::42 or src host 2a00:8642:42::75 or src host 2a12:d8c0:105a:9001::a154)'

If you see our PTBs arriving but the destination's TCP/Echo flow does not shrink, the drop is in the destination kernel (cause 3 below). If you don't see them at all, drop is upstream of you (cause 2). If you only see them from one of our two source IPs, the drop is path-asymmetric — one transit on the asymmetric route is filtering, the other is not.

From NL host (go6lab) transit only unreachable

filter likely at: past AS174 (COGENT-174) · min PMTU on path: 1500

0/4

Echo small (56B) -

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a00:8642:42::3	1.4ms	0%	AS203993	STEFFANN-DC-AS - S.J.M. Steffann, NL
2	gw.friends.steffann.nl 2a00:8642:1000:f000::1	2.1ms	0%*	AS203993	STEFFANN-DC-AS - S.J.M. Steffann, NL
3	2a00:1ca8:1::194	2.9ms	20%	AS50673	Serverius-as - Serverius Holding B.V., NL
4	2a03:3f40::10:41	2.4ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
5	*	-	90%	-
6	*	-	90%	-
7	be2950.ccr42.fra05.atlas.cogentco.com 2001:550:0:1000::9a36:482a	11.9ms	0%	AS174	COGENT-174 - Cogent Communications, LLC, US
8	*	-	-	-
9	port-channel5891.ccr91.mil02.atlas.cogentco.com 2001:550:0:1000::9a36:3db5	25.5ms	0%	AS174	COGENT-174 - Cogent Communications, LLC, US
10	be4690.agr62.mil02.atlas.cogentco.com 2001:550:0:1000::9a36:3f3d	24.8ms	0%	AS174	COGENT-174 - Cogent Communications, LLC, US
11	be4982.nr11.b062110-0.mil02.atlas.cogentco.com 2001:550:0:1000::9a19:109e	27.4ms	0%	AS174	COGENT-174 - Cogent Communications, LLC, US
12	2001:978:2:2a::4c:2	45.7ms	0%	AS174	COGENT-174 - Cogent Communications, LLC, US
13	2001:978:2:2a::4c:2	28.0ms	0%	AS174	COGENT-174 - Cogent Communications, LLC, US

Rate-limited ICMPv6: hop 3, hop 5, hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.034ms pmtu 1500
 1:  2a00:8642:42::3                                       1.947ms 
 1:  2a00:8642:42::3                                       1.663ms 
 2:  gw.friends.steffann.nl                                2.874ms 
 3:  2a00:1ca8:1::194                                      3.423ms 
 4:  2a03:3f40::10:41                                      3.133ms 
 5:  no reply
 6:  be3457.ccr41.ams03.atlas.cogentco.com                 4.714ms 
 7:  be3343.ccr41.fra05.atlas.cogentco.com                11.941ms 
 8:  be7944.ccr22.muc03.atlas.cogentco.com                17.370ms 
 9:  port-channel5892.ccr92.mil02.atlas.cogentco.com      25.596ms 
10:  be3333.agr62.mil02.atlas.cogentco.com                26.631ms 
11:  be4981.nr11.b062110-0.mil02.atlas.cogentco.com       28.564ms 
12:  2001:978:2:2a::4c:2                                  27.431ms 
13:  2001:978:2:2a::4c:2                                  27.478ms !A
     Resume: pmtu 1500

From ITA host (Karsolink) transit only unreachable

filter likely at: past AS203201 (IT-SUPERNAP) · min PMTU on path: 1500

0/4

Echo small (56B) -

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	karsolink-01.net.karsolink.com 2a12:d8c0:105a:9001::1	0.3ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
2	2a12:d8c0:109f:121::a1	0.4ms	-	AS204471	KARSOLINK - 2S Computers SRL, IT
3	2a12:d8c0:101f:103::1	8.4ms	80%	AS204471	KARSOLINK - 2S Computers SRL, IT
4	supernap-v6.mix-it.net @MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO 2001:7f8:b:100:1d1:a520:3201:218	9.6ms	0%	-	NA
5	2a07:2e80:0:302::1	9.4ms	0%	AS203201	IT-SUPERNAP - INFRASTRUCTURE ITALIA COLO S.R.L., IT
6	2a07:2e80:0:302::1	9.7ms	0%	AS203201	IT-SUPERNAP - INFRASTRUCTURE ITALIA COLO S.R.L., IT

Rate-limited ICMPv6: hop 3 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.039ms pmtu 1500
 1:  no reply
 2:  2a12:d8c0:109f:121::a1                                1.072ms 
 3:  2a12:d8c0:101f:103::1                                 9.068ms 
 4:  supernap-v6.mix-it.net                                9.921ms 
 5:  2a07:2e80:0:302::1                                    9.966ms 
 6:  2a07:2e80:0:302::1                                    9.903ms !A
     Resume: pmtu 1500

From SLO host (6connect) transit only unreachable

filter likely at: past AS203201 (IT-SUPERNAP) · min PMTU on path: 1500

0/4

Echo small (56B) -

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	fw1-lju.6connect.com 2607:fae0:a000::2	1.0ms	0%*	AS8038	6CONNECT - 6connect, Inc., US
2	*	-	0%*	-
3	2a03:a100:0:201:1::1	0.6ms	30%	AS56635	XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI
4	e0-1.core1.lju1.he.net 2001:470:1:5be::1	1.9ms	10%	AS6939	HURRICANE - Hurricane Electric LLC, US
5	*	-	-	-
6	port-channel1.core1.zag2.he.net 2001:470:0:2ea::2	4.0ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	*	-	-	-
8	supernap-v6.mix-it.net @MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO 2001:7f8:b:100:1d1:a520:3201:218	11.1ms	0%	-	NA
9	2a07:2e80:0:302::1	11.1ms	0%	AS203201	IT-SUPERNAP - INFRASTRUCTURE ITALIA COLO S.R.L., IT
10	2a07:2e80:0:302::1	11.6ms	0%	AS203201	IT-SUPERNAP - INFRASTRUCTURE ITALIA COLO S.R.L., IT

Rate-limited ICMPv6: hop 3, hop 4 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.026ms pmtu 1500
 1:  fw1-lju.6connect.com                                  0.481ms 
 1:  fw1-lju.6connect.com                                  0.427ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  0.779ms 
 4:  e0-1.core1.lju1.he.net                                2.186ms 
 5:  no reply
 6:  port-channel1.core1.zag2.he.net                       4.182ms 
 7:  no reply
 8:  supernap-v6.mix-it.net                               11.378ms asymm  7 
 9:  2a07:2e80:0:302::1                                   11.062ms asymm  8 
10:  2a07:2e80:0:302::1                                   11.170ms !A
     Resume: pmtu 1500