AS213260 - CWNET-AS cwnet s.r.lPARPKI ✓ 1/1ASPA -

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IPv6 prefix announced, but nothing inside is responding yet. AS213260 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:f500::1 · (no live host found) · address space: PA · prefixes announced: 1

prefix(es): 2a07:f500::/29

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

MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO member - Open peering, peering member, since 2024-07-23. IPv6 LAN: 2001:7f8:b:100:1d1:a521:3260:205. Locations: -.

RPKI & ASPA

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

PrefixRPKI stateReasonCovering VRP(s)
2a07:f500::/29✓ validmatched VRP (correct origin, length within maxLength)AS213260 /29 maxLen 29 (ripe)

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

We probed 15 arbitrary IPv6 address(es) inside AS213260's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a02:4d0:3:e000::5 at hop 11 - that router does not answer ICMPv6 Echo. This is not in AS213260'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 2026-05-25T12:34:53Z

Failure detail — what to grep in your logs
vantageour sourceyour targetmethodresulttested (UTC)
go6lab2a00:8642:42::752a07:f500::1icmp6-echono_echo2026-05-25T12:34:53Z
karsolink2a12:d8c0:105a:9001::a1542a07:f500::1icmp6-echono_echo2026-05-25T12:44:45Z
odin2607:fae0:a000::422a07:f500::1icmp6-echono_echo2026-05-25T12:34:28Z

Attempt log (go6lab):

  1. icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
  2. dns-tcp → no_tcp: connect failed: timed out
  3. tls → no_tcp: TLS connect failed
  4. http → no_tcp: tcp/80 not open

Attempt log (karsolink):

  1. icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
  2. dns-tcp → no_tcp: connect failed: timed out
  3. tls → no_tcp: TLS connect failed
  4. http → no_tcp: tcp/80 not open

Attempt log (odin):

  1. icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
  2. dns-tcp → no_tcp: connect failed: timed out
  3. tls → no_tcp: TLS connect failed
  4. 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 AS8816 (IT-STCOM) · min PMTU on path: 1500

0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
12a00:8642:42::31.0ms0%AS203993STEFFANN-DC-AS - S.J.M. Steffann, NL
2*-0%*-
32a00:1ca8:1::1942.8ms10%AS50673Serverius-as - Serverius Holding B.V., NL
42a03:3f40::10:412.5ms10%AS50673Serverius-as - Serverius Holding B.V., NL
52001:b28:3ff::1b1b:0:126.7ms10%AS31500GNM-AS - Global Network Management Inc, AG
6*---
7*---
8*---
9metrolink.minap.it
2001:7f8:c5::a500:8816:1		37.8ms0%AS8816Metrolink s.r.l.
10br-mix-fo21.metrolink.it
2a02:4d0:0:220::2		38.2ms0%AS8816IT-STCOM - Metrolink S.R.L., IT
11cwnet-metrolink-mix.metrolink.it
2a02:4d0:3:e000::5		38.2ms0%AS8816IT-STCOM - Metrolink S.R.L., IT
12*---
13*---
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Rate-limited ICMPv6: hop 3, hop 4, hop 5 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.043ms pmtu 1500
 1:  2a00:8642:42::3                                       2.328ms 
 1:  2a00:8642:42::3                                       1.759ms 
 2:  gw.friends.steffann.nl                                2.763ms 
 3:  2a00:1ca8:1::194                                      3.308ms 
 4:  2a03:3f40::10:41                                      2.813ms 
 5:  2001:b28:3ff::1b1b:0:1                               26.944ms asymm  6 
 6:  be2.core1.cph1.he.net                                28.256ms asymm  5 
 7:  no reply
 8:  no reply
 9:  metrolink.minap.it                                   37.851ms 
10:  br-mix-fo20.metrolink.it                             38.727ms 
11:  cwnet-metrolink-mix.metrolink.it                     37.541ms 
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
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 AS8816 (IT-STCOM) · min PMTU on path: 1500

0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1*-0%*-
2*---
32a12:d8c0:101f:103::18.5ms10%AS204471KARSOLINK - 2S Computers SRL, IT
42001:7f8:b9::34:114.9ms10%-NA
5*-10%-
6cwnet-metrolink-mix.metrolink.it
2a02:4d0:3:e000::5		14.2ms0%AS8816IT-STCOM - Metrolink S.R.L., IT
7*---
8*---
9*---
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11*---
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Rate-limited ICMPv6: hop 3, hop 4, hop 5 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.030ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.652ms 
 1:  karsolink-01.net.karsolink.com                        0.634ms 
 2:  2a12:d8c0:109f:121::a1                                0.704ms 
 3:  2a12:d8c0:101f:103::1                                 8.946ms 
 4:  2001:7f8:b9::34:1                                    15.395ms 
 5:  br-mix-fo21.metrolink.it                             15.241ms 
 6:  cwnet-metrolink-mix.metrolink.it                     14.789ms asymm  4 
 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
21:  no reply
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: no path · min PMTU on path: 1500

0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1fw1-lju.6connect.com
2607:fae0:a000::2		0.3ms0%*AS80386CONNECT - 6connect, Inc., US
2*---
32a00:ee1:800:9::11.8ms0%AS5603SIOL-NET - Telekom Slovenije, d.d., SI
42a00:ee0:1:10::21.2ms0%AS5603SIOL-NET - Telekom Slovenije, d.d., SI
52a11:4142:20021.0ms0%-
62620:107:4008:e85::28.0ms0%-NA
7cwnet-AS213260.mix-it.net @MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO
2001:7f8:b:100:1d1:a521:3260:205		10.6ms0%-NA
8*---
9*---
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tracepath -6

 1?: [LOCALHOST]                        0.027ms pmtu 1500
 1:  fw1-lju.6connect.com                                  0.496ms 
 1:  fw1-lju.6connect.com                                  0.388ms 
 2:  no reply
 3:  2a00:ee1:800:9::1                                     2.253ms 
 4:  2a00:ee0:1:15::2                                      1.281ms asymm  3 
 5:  2a11:4142:2002::                                      0.964ms asymm  6 
 6:  2620:107:4008:e85::2                                  8.229ms asymm  7 
 7:  cwnet-AS213260.mix-it.net                            10.868ms asymm  8 
 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
21:  no reply
22:  no reply
23:  no reply
24:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500