AS44652 AS36IPV4 3punto6 srl

IPv6 prefix announced, but nothing inside is responding yet. AS44652 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: 2a07:59c0::1 · (no live host found) · address space: PA · prefixes announced: 1

prefix(es): 2a07:59c0::/29

RPKI & ASPA

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

Prefix	RPKI state	Reason	Covering VRP(s)
`2a07:59c0::/29`	✓ valid	matched VRP (correct origin, length within maxLength)	AS44652 /29 maxLen 29 (ripe)

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

We probed 15 arbitrary IPv6 address(es) inside AS44652's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:1418:1::1272 at hop 6 - that router answers ICMPv6 Echo. This is not in AS44652'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 2026-05-25T12:34:34Z

Failure detail — what to grep in your logs

vantage	our source	your target	method	result	tested (UTC)
go6lab	`2a00:8642:42::75`	`2a07:59c0::1`	`icmp6-echo`	no_echo	2026-05-25T12:34:34Z
karsolink	`2a12:d8c0:105a:9001::a154`	`2a07:59c0::1`	`icmp6-echo`	no_echo	2026-05-25T12:44:00Z
odin	`2607:fae0:a000::42`	`2a07:59c0::1`	`icmp6-echo`	no_echo	2026-05-25T12:34:12Z

Attempt log (go6lab):

icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
dns-tcp → no_tcp: connect failed: timed out
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: timed out
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: timed out
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 AS12779 (ITGATE) · min PMTU on path: 1500

0/4

Echo small (56B) -

0/4

Echo 1500B (DF) -

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a00:8642:42::3	1.7ms	0%	AS203993	STEFFANN-DC-AS - S.J.M. Steffann, NL
2	gw.friends.steffann.nl 2a00:8642:1000:f000::1	2.2ms	0%*	AS203993	STEFFANN-DC-AS - S.J.M. Steffann, NL
3	ccr2-ccr1.dc1.nogalliance.org 2a00:8642:dc1:2::b	2.3ms	0%	AS203993	STEFFANN-DC-AS - S.J.M. Steffann, NL
4	ams-ix.ipv6.itgate.net 2001:7f8:1::a501:2779:1	5.1ms	0%	-	NA
5	po2.nx01.colo.TRN2.ipv6.itgate.net 2001:1418:1::1252	21.4ms	0%	AS12779	ITGATE - IT.Gate S.p.A., IT
6	*	-	-	-
7	*	-	-	-
8	*	-	-	-
9	*	-	-	-
10	*	-	-	-
11	*	-	-	-
12	*	-	-	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-
21	*	-	-	-
22	*	-	-	-
23	*	-	-	-
24	*	-	-	-

tracepath -6

 1?: [LOCALHOST]                        0.031ms pmtu 1500
 1:  2a00:8642:42::3                                       1.353ms 
 1:  2a00:8642:42::3                                       1.216ms 
 2:  gw.friends.steffann.nl                                2.118ms 
 3:  ccr2-ccr1.dc1.nogalliance.org                         2.139ms asymm  2 
 4:  ams-ix.ipv6.itgate.net                                4.265ms asymm  3 
 5:  po2.nx02.colo.TRN2.ipv6.itgate.net                   21.942ms asymm  6 
 6:  no reply
 7:  no reply
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
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18:  no reply
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20:  no reply
21:  no reply
22:  no reply
23:  no reply
24:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From ITA host (Karsolink) transit only unreachable

filter likely at: past AS12779 (ITGATE) · min PMTU on path: 1500

0/4

Echo small (56B) -

0/4

Echo 1500B (DF) -

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	0.5ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
2	2a12:d8c0:109f:121::a1	0.3ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
3	2a12:d8c0:101f:6::1	10.1ms	60%	AS204471	KARSOLINK - 2S Computers SRL, IT
4	itgate.minap.it 2001:7f8:c5::a501:2779:1	10.7ms	0%	AS12779	ITgate S.p.A.
5	po2.nx02.colo.TRN2.ipv6.itgate.net 2001:1418:1::1272	12.5ms	0%	AS12779	ITGATE - IT.Gate S.p.A., IT
6	*	-	-	-
7	*	-	-	-
8	*	-	-	-
9	*	-	-	-
10	*	-	-	-
11	*	-	-	-
12	*	-	-	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-
21	*	-	-	-
22	*	-	-	-
23	*	-	-	-
24	*	-	-	-

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

tracepath -6

 1?: [LOCALHOST]                        0.027ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.664ms 
 1:  karsolink-01.net.karsolink.com                        0.841ms 
 2:  2a12:d8c0:109f:121::a1                                0.952ms 
 3:  2a12:d8c0:101f:6::1                                  10.359ms 
 4:  itgate.minap.it                                      11.310ms 
 5:  po2.nx02.colo.trn2.ipv6.itgate.net                   13.301ms asymm  6 
 6:  no reply
 7:  no reply
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
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22:  no reply
23:  no reply
24:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From SLO host (6connect) transit only unreachable

filter likely at: past AS12779 (ITGATE) · min PMTU on path: 1500

0/4

Echo small (56B) -

0/4

Echo 1500B (DF) -

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	0.4ms	0%*	AS8038	6CONNECT - 6connect, Inc., US
2	*	-	0%*	-
3	2a00:ee1:800:9::1	1.9ms	10%	AS5603	SIOL-NET - Telekom Slovenije, d.d., SI
4	2a00:ee0:1:10::2	1.2ms	0%	AS5603	SIOL-NET - Telekom Slovenije, d.d., SI
5	de-cix.fra.ipv6.itgate.net 2001:7f8::31eb:0:1	14.9ms	0%	-	NA
6	po2.nx01.colo.TRN2.ipv6.itgate.net 2001:1418:1::1252	17.1ms	0%	AS12779	ITGATE - IT.Gate S.p.A., IT
7	*	-	-	-
8	*	-	-	-
9	*	-	-	-
10	*	-	-	-
11	*	-	-	-
12	*	-	-	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-
21	*	-	-	-
22	*	-	-	-
23	*	-	-	-
24	*	-	-	-

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

tracepath -6

 1?: [LOCALHOST]                        0.029ms pmtu 1500
 1:  fw1-lju.6connect.com                                  0.433ms 
 1:  fw1-lju.6connect.com                                  0.414ms 
 2:  no reply
 3:  2a00:ee1:800:9::1                                     1.798ms 
 4:  2a00:ee0:1:10::2                                      1.140ms asymm  3 
 5:  de-cix.fra.ipv6.itgate.net                           15.036ms asymm  9 
 6:  po2.nx02.colo.TRN2.ipv6.itgate.net                   17.386ms asymm  9 
 7:  no reply
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
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24:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500