AS207146 netikom-as Netikom SRL

IPv6 prefix announced, but nothing inside is responding yet. AS207146 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: 2a0d:2c40::1 · (no live host found) · address space: PA · prefixes announced: 1

prefix(es): 2a0d:2c40::/29

RPKI & ASPA

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

Prefix	RPKI state	Reason	Covering VRP(s)
`2a0d:2c40::/29`	✓ valid	matched VRP (correct origin, length within maxLength)	AS207146 /29 maxLen 48 (ripe)

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

We probed 15 arbitrary IPv6 address(es) inside AS207146's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a02:2d8:4:801:232a:: at hop 24 - that router answers ICMPv6 Echo. This is not in AS207146'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 2026-05-25T12:36:31Z

Failure detail — what to grep in your logs

vantage	our source	your target	method	result	tested (UTC)
go6lab	`2a00:8642:42::75`	`2a0d:2c40::1`	`icmp6-echo`	no_echo	2026-05-25T12:36:31Z
karsolink	`2a12:d8c0:105a:9001::a154`	`2a0d:2c40::1`	`icmp6-echo`	no_echo	2026-05-25T12:47:42Z
odin	`2607:fae0:a000::42`	`2a0d:2c40::1`	`icmp6-echo`	no_echo	2026-05-25T12:36:05Z

Attempt log (go6lab):

icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
dns-tcp → no_tcp: connect failed: [Errno 113] No route to host
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 113] No route to host
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 113] No route to host
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: no path · 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	0.9ms	0%	AS203993	STEFFANN-DC-AS - S.J.M. Steffann, NL
2	gw.friends.steffann.nl 2a00:8642:1000:f000::1	1.9ms	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	5.5ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
5	2a02:2d8:1:a001:232a	4.5ms	0%	-
6	RT.DT4.MIL.IT.retn.net 2a02:2d8::57f5:e07f	18.6ms	0%	AS9002	RETN-AS - RETN Limited, GB
7	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	19.0ms	40%	AS9002	RETN-AS - RETN Limited, GB
8	2a02:2d8:4:801:232a	19.5ms	0%	-
9	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	19.5ms	60%	AS9002	RETN-AS - RETN Limited, GB
10	2a02:2d8:4:801:232a	19.4ms	0%	-
11	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	20.0ms	-	AS9002	RETN-AS - RETN Limited, GB
12	2a02:2d8:4:801:232a	49.2ms	0%	-
13	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	20.0ms	-	AS9002	RETN-AS - RETN Limited, GB
14	2a02:2d8:4:801:232a	20.0ms	0%	-
15	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	19.7ms	-	AS9002	RETN-AS - RETN Limited, GB
16	2a02:2d8:4:801:232a	47.8ms	0%	-
17	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	19.9ms	90%	AS9002	RETN-AS - RETN Limited, GB
18	2a02:2d8:4:801:232a	20.6ms	0%	-
19	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	19.5ms	-	AS9002	RETN-AS - RETN Limited, GB
20	2a02:2d8:4:801:232a	20.5ms	0%	-
21	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	19.8ms	-	AS9002	RETN-AS - RETN Limited, GB
22	2a02:2d8:4:801:232a	20.7ms	0%	-
23	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	19.4ms	-	AS9002	RETN-AS - RETN Limited, GB
24	2a02:2d8:4:801:232a	20.8ms	0%	-

Rate-limited ICMPv6: hop 7, hop 9, hop 17 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.038ms pmtu 1500
 1:  2a00:8642:42::3                                       1.314ms 
 1:  2a00:8642:42::3                                       1.251ms 
 2:  gw.friends.steffann.nl                                2.029ms 
 3:  2a00:1ca8:1::194                                      3.152ms 
 4:  2a03:3f40::10:33                                      5.465ms 
 5:  ae1-499.RT.SRV.DRO.NL.retn.net                        4.272ms 
 6:  RT.DT4.MIL.IT.retn.net                               19.162ms 
 7:  GW-Netikom.retn.net                                  19.539ms 
 8:  ae0-1405.RT.DT4.MIL.IT.retn.net                      20.132ms asymm  6 
 9:  GW-Netikom.retn.net                                  20.124ms asymm  7 
10:  ae0-1405.RT.DT4.MIL.IT.retn.net                      20.332ms asymm  6 
11:  GW-Netikom.retn.net                                  19.084ms asymm  7 
12:  ae0-1405.RT.DT4.MIL.IT.retn.net                      21.184ms asymm  6 
13:  GW-Netikom.retn.net                                  19.870ms asymm  7 
14:  ae0-1405.RT.DT4.MIL.IT.retn.net                      19.829ms asymm  6 
15:  GW-Netikom.retn.net                                  19.454ms asymm  7 
16:  ae0-1405.RT.DT4.MIL.IT.retn.net                      20.549ms asymm  6 
17:  GW-Netikom.retn.net                                  19.859ms asymm  7 
18:  ae0-1405.RT.DT4.MIL.IT.retn.net                      20.112ms asymm  6 
19:  GW-Netikom.retn.net                                  20.254ms asymm  7 
20:  ae0-1405.RT.DT4.MIL.IT.retn.net                      20.260ms asymm  6 
21:  GW-Netikom.retn.net                                  20.442ms asymm  7 
22:  ae0-1405.RT.DT4.MIL.IT.retn.net                      20.601ms asymm  6 
23:  GW-Netikom.retn.net                                  20.124ms asymm  7 
24:  ae0-1405.RT.DT4.MIL.IT.retn.net                      20.816ms asymm  6 
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From ITA host (Karsolink) transit only unreachable

filter likely at: no path · 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:d8c0:101f:103::1	8.5ms	0%	AS204471	KARSOLINK - 2S Computers SRL, IT
4	2a02:2d8:1:b80d:232a	7.8ms	0%	-
5	RT.DT4.MIL.IT.retn.net 2a02:2d8::57f5:e07f	8.9ms	0%	AS9002	RETN-AS - RETN Limited, GB
6	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	8.8ms	90%	AS9002	RETN-AS - RETN Limited, GB
7	2a02:2d8:4:801:232a	8.7ms	0%	-
8	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	8.9ms	90%	AS9002	RETN-AS - RETN Limited, GB
9	2a02:2d8:4:801:232a	8.8ms	0%	-
10	*	-	30%	-
11	2a02:2d8:4:801:232a	9.1ms	0%	-
12	*	-	70%	-
13	2a02:2d8:4:801:232a	9.5ms	0%	-
14	*	-	-	-
15	2a02:2d8:4:801:232a	9.2ms	0%	-
16	*	-	-	-
17	2a02:2d8:4:801:232a	9.1ms	0%	-
18	*	-	-	-
19	2a02:2d8:4:801:232a	9.5ms	0%	-
20	*	-	90%	-
21	2a02:2d8:4:801:232a	9.3ms	0%	-
22	*	-	-	-
23	2a02:2d8:4:801:232a	11.7ms	0%	-
24	*	-	-	-

Rate-limited ICMPv6: hop 6, hop 8, hop 10, hop 12, hop 20 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.029ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.763ms 
 1:  karsolink-01.net.karsolink.com                        0.674ms 
 2:  2a12:d8c0:109f:121::a1                                1.041ms 
 3:  2a12:d8c0:101f:103::1                                 9.005ms 
 4:  ae8-202.RT.CLR.MIL.IT.retn.net                        8.137ms asymm  5 
 5:  RT.DT4.MIL.IT.retn.net                                9.317ms 
 6:  GW-Netikom.retn.net                                   9.293ms 
 7:  ae0-1405.RT.DT4.MIL.IT.retn.net                      12.286ms asymm  5 
 8:  GW-Netikom.retn.net                                   9.505ms asymm  6 
 9:  ae0-1405.RT.DT4.MIL.IT.retn.net                       9.788ms asymm  5 
10:  GW-Netikom.retn.net                                   9.500ms asymm  6 
11:  ae0-1405.RT.DT4.MIL.IT.retn.net                       9.611ms asymm  5 
12:  GW-Netikom.retn.net                                   9.530ms asymm  6 
13:  ae0-1405.RT.DT4.MIL.IT.retn.net                       9.819ms asymm  5 
14:  GW-Netikom.retn.net                                   9.558ms asymm  6 
15:  ae0-1405.RT.DT4.MIL.IT.retn.net                       9.986ms asymm  5 
16:  GW-Netikom.retn.net                                   9.722ms asymm  6 
17:  ae0-1405.RT.DT4.MIL.IT.retn.net                       9.912ms asymm  5 
18:  GW-Netikom.retn.net                                  10.123ms asymm  6 
19:  ae0-1405.RT.DT4.MIL.IT.retn.net                       9.751ms asymm  5 
20:  GW-Netikom.retn.net                                  10.013ms asymm  6 
21:  ae0-1405.RT.DT4.MIL.IT.retn.net                      10.215ms asymm  5 
22:  GW-Netikom.retn.net                                   9.932ms asymm  6 
23:  ae0-1405.RT.DT4.MIL.IT.retn.net                      10.064ms asymm  5 
24:  GW-Netikom.retn.net                                  10.151ms asymm  6 
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From SLO host (6connect) transit only unreachable

filter likely at: no path · 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	0.5ms	0%*	AS8038	6CONNECT - 6connect, Inc., US
2	ccr-to-fw-ccr1-gw-lju.6connect.com 2607:fae0:a000:2::2	0.7ms	-	AS8038	6CONNECT - 6connect, Inc., US
3	2a00:ee1:800:9::1	1.7ms	0%	AS5603	SIOL-NET - Telekom Slovenije, d.d., SI
4	2a00:ee0:1:10::2	1.0ms	0%	AS5603	SIOL-NET - Telekom Slovenije, d.d., SI
5	de-cix1.rt.act.fkt.de.retn.net 2001:7f8::232a:0:1	14.5ms	10%	-	NA
6	RT.DT4.MIL.IT.retn.net 2a02:2d8::57f5:e07f	16.8ms	0%	AS9002	RETN-AS - RETN Limited, GB
7	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	16.2ms	10%	AS9002	RETN-AS - RETN Limited, GB
8	2a02:2d8:4:801:232a	16.1ms	0%	-
9	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	16.1ms	90%	AS9002	RETN-AS - RETN Limited, GB
10	2a02:2d8:4:801:232a	16.2ms	0%	-
11	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	16.1ms	-	AS9002	RETN-AS - RETN Limited, GB
12	2a02:2d8:4:801:232a	16.1ms	0%	-
13	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	16.7ms	-	AS9002	RETN-AS - RETN Limited, GB
14	2a02:2d8:4:801:232a	16.4ms	0%	-
15	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	16.4ms	-	AS9002	RETN-AS - RETN Limited, GB
16	2a02:2d8:4:801:232a	16.5ms	0%	-
17	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	18.7ms	-	AS9002	RETN-AS - RETN Limited, GB
18	2a02:2d8:4:801:232a	17.5ms	0%	-
19	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	16.7ms	90%	AS9002	RETN-AS - RETN Limited, GB
20	2a02:2d8:4:801:232a	16.7ms	0%	-
21	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	16.6ms	-	AS9002	RETN-AS - RETN Limited, GB
22	2a02:2d8:4:801:232a	16.6ms	0%	-
23	GW-Netikom.retn.net 2a02:2d8:4:801:232a::1	16.7ms	-	AS9002	RETN-AS - RETN Limited, GB
24	2a02:2d8:4:801:232a	17.1ms	0%	-

Rate-limited ICMPv6: hop 5, hop 7, hop 9, hop 19 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.038ms pmtu 1500
 1:  fw1-lju.6connect.com                                  0.594ms 
 1:  fw1-lju.6connect.com                                  0.643ms 
 2:  no reply
 3:  2a00:ee1:800:9::1                                     2.159ms 
 4:  2a00:ee0:1:10::2                                      1.170ms asymm  3 
 5:  de-cix1.rt.act.fkt.de.retn.net                       14.658ms asymm  9 
 6:  RT.DT4.MIL.IT.retn.net                               16.167ms asymm  9 
 7:  GW-Netikom.retn.net                                  16.397ms asymm 10 
 8:  ae0-1405.RT.DT4.MIL.IT.retn.net                      16.488ms asymm  9 
 9:  GW-Netikom.retn.net                                  16.399ms asymm 10 
10:  ae0-1405.RT.DT4.MIL.IT.retn.net                      16.405ms asymm  9 
11:  GW-Netikom.retn.net                                  17.297ms asymm 10 
12:  ae0-1405.RT.DT4.MIL.IT.retn.net                      16.418ms asymm  9 
13:  GW-Netikom.retn.net                                  16.937ms asymm 10 
14:  ae0-1405.RT.DT4.MIL.IT.retn.net                      16.813ms asymm  9 
15:  GW-Netikom.retn.net                                  16.515ms asymm 10 
16:  ae0-1405.RT.DT4.MIL.IT.retn.net                      16.518ms asymm  9 
17:  GW-Netikom.retn.net                                  16.977ms asymm 10 
18:  ae0-1405.RT.DT4.MIL.IT.retn.net                      17.425ms asymm  9 
19:  GW-Netikom.retn.net                                  16.753ms asymm 10 
20:  ae0-1405.RT.DT4.MIL.IT.retn.net                      17.506ms asymm  9 
21:  GW-Netikom.retn.net                                  17.403ms asymm 10 
22:  ae0-1405.RT.DT4.MIL.IT.retn.net                      16.790ms asymm  9 
23:  GW-Netikom.retn.net                                  17.081ms asymm 10 
24:  ae0-1405.RT.DT4.MIL.IT.retn.net                      17.366ms asymm  9 
     Too many hops: pmtu 1500
     Resume: pmtu 1500