AS199606 NIMWAVE Nim Wave srl

IPv6 prefix announced, but nothing inside is responding yet. AS199606 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: 2a01:a7c0::1 · (no live host found) · address space: PA · prefixes announced: 1

prefix(es): 2a01:a7c0::/32

RPKI & ASPA

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

Prefix	RPKI state	Reason	Covering VRP(s)
`2a01:a7c0::/32`	✓ valid	matched VRP (correct origin, length within maxLength)	AS199606 /32 maxLen 37 (ripe)

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

We probed 15 arbitrary IPv6 address(es) inside AS199606's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:1bd0:1:e::2 at hop 15 - that router answers ICMPv6 Echo. This is not in AS199606'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 2026-05-25T12:30:46Z

Failure detail — what to grep in your logs

vantage	our source	your target	method	result	tested (UTC)
go6lab	`2a00:8642:42::75`	`2a01:a7c0::1`	`icmp6-echo`	no_echo	2026-05-25T12:30:46Z
karsolink	`2a12:d8c0:105a:9001::a154`	`2a01:a7c0::1`	`icmp6-echo`	no_echo	2026-05-25T12:36:47Z
odin	`2607:fae0:a000::42`	`2a01:a7c0::1`	`icmp6-echo`	no_echo	2026-05-25T12:30:32Z

Attempt log (go6lab):

icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
dns-tcp → no_tcp: connect failed: [Errno 101] Network is unreachable
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 101] Network is unreachable
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 101] Network is unreachable
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 AS28716 (RETELIT-AS) · 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	1.4ms	0%	AS203993	STEFFANN-DC-AS - S.J.M. Steffann, NL
2	gw.friends.steffann.nl 2a00:8642:1000:f000::1	2.3ms	0%*	AS203993	STEFFANN-DC-AS - S.J.M. Steffann, NL
3	2a00:1ca8:1::194	3.0ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
4	2a03:3f40::10:33	6.6ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
5	ae22-404.ams10.core-backbone.com 2a01:4a0:1338:155::1	5.4ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
6	ae16-2074.fra10.core-backbone.com 2a01:4a0:0:2074::3	10.9ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
7	ae2-2021.fra20.core-backbone.com 2a01:4a0:0:2021::4	10.8ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
8	6te2-2.mivivxmr01.retelit.it 2001:7f8::702c:0:1	26.0ms	0%	-	NA
9	2001:1bd0:0:2::5	21.0ms	0%	AS28716	RETELIT-AS - Retelit Digital Services S.p.A., IT
10	2001:1bd0:1:e::2	21.5ms	90%	AS28716	RETELIT-AS - Retelit Digital Services S.p.A., IT

Rate-limited ICMPv6: hop 10 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.029ms pmtu 1500
 1:  2a00:8642:42::3                                       1.381ms 
 1:  2a00:8642:42::3                                       1.676ms 
 2:  gw.friends.steffann.nl                                1.884ms 
 3:  2a00:1ca8:1::194                                      2.880ms 
 4:  2a03:3f40::10:33                                      5.807ms 
 5:  ae22-404.ams10.core-backbone.com                      5.773ms 
 6:  ae16-2074.fra10.core-backbone.com                    11.247ms 
 7:  ae2-2021.fra20.core-backbone.com                     11.379ms 
 8:  6te2-2.mivivxmr01.retelit.it                         21.928ms asymm  7 
 9:  2001:1bd0:0:2::5                                     20.869ms asymm  8 
10:  ???                                                  22.154ms !N
     Resume: pmtu 1500

From ITA host (Karsolink) transit only unreachable

filter likely at: past AS28716 (RETELIT-AS) · 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	0.4ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
2	2a12:d8c0:109f:121::a1	0.4ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
3	2a12:d8c0:109f:106::a2	3.2ms	0%	AS204471	KARSOLINK - 2S Computers SRL, IT
4	retelit.topix.it 2001:7f8:23:ffff::26	10.1ms	0%	-	NA
5	2001:1bd0:0:2::5	10.1ms	0%	AS28716	RETELIT-AS - Retelit Digital Services S.p.A., IT
6	2001:1bd0:1:e::2	10.5ms	90%	AS28716	RETELIT-AS - Retelit Digital Services S.p.A., IT

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

tracepath -6

 1?: [LOCALHOST]                        0.030ms pmtu 1500
 1:  no reply
 2:  no reply
 3:  2a12:d8c0:109f:106::a2                                3.768ms 
 4:  retelit.topix.it                                     10.661ms asymm  7 
 5:  2001:1bd0:0:2::5                                     10.778ms asymm  6 
 6:  ???                                                  11.037ms !N
     Resume: pmtu 1500

From SLO host (6connect) transit only unreachable

filter likely at: past AS28716 (RETELIT-AS) · 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	0.3ms	0%*	AS8038	6CONNECT - 6connect, Inc., US
2	ccr-to-fw-ccr1-gw-lju.6connect.com 2607:fae0:a000:2::2	0.6ms	-	AS8038	6CONNECT - 6connect, Inc., US
3	2a00:ee1:800:9::1	1.6ms	0%	AS5603	SIOL-NET - Telekom Slovenije, d.d., SI
4	2a00:ee0:1:10::2	0.9ms	0%	AS5603	SIOL-NET - Telekom Slovenije, d.d., SI
5	6te2-2.mivivxmr01.retelit.it 2001:7f8::702c:0:1	17.1ms	0%	-	NA
6	2001:1bd0:0:2::5	17.1ms	0%	AS28716	RETELIT-AS - Retelit Digital Services S.p.A., IT
7	2001:1bd0:1:e::2	17.6ms	90%	AS28716	RETELIT-AS - Retelit Digital Services S.p.A., IT

Rate-limited ICMPv6: hop 7 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.033ms pmtu 1500
 1:  fw1-lju.6connect.com                                  0.553ms 
 1:  fw1-lju.6connect.com                                  0.430ms 
 2:  no reply
 3:  2a00:ee1:800:9::1                                     2.157ms 
 4:  2a00:ee0:1:15::2                                      1.112ms asymm  3 
 5:  6te2-2.mivivxmr01.retelit.it                         17.347ms asymm 10 
 6:  2001:1bd0:0:2::5                                     21.603ms asymm  9 
 7:  ???                                                  18.108ms !N
     Resume: pmtu 1500