AS overview
Test target: 2a0c:bdc0:1001::c224:4b32 · ns01.i-domini.it · address space: PA · prefixes announced: 3
prefix(es): 2a02:6120::/29, 2a0c:bdc0::/29, 2a0a:bfc0::/29
Targets & per-vantage-point probe results (5 target(s) across 3 vantage point(s))
Source codes (hover any badge for full description): CUR=curated · NS/SOA/MX=DNS records · SPF=SPF TXT · DRV=holder-derived (www, ns1, mail, gw, …) · ATL=RIPE Atlas · PDB=PeeringDB · WHOIS=RIPE whois · RDAP=RIPE RDAP · HIT=IPv6 Hitlist · RTR=in-prefix path hop (router) · PRB=static prefix probe · SYN=synthetic prefix::1 fallback
| Target IP / hostname | Source | NL host (go6lab) | ITA host (Karsolink) | SLO host (6connect) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ||
2a0c:bdc0:1000:1::b93a:74bmailshield.cloud-email.it | MX | ✓ | ✓ | ? | ? | - | ✓ | ✓ | ? | ? | - | ✓ | ✓ | ? | ? | - |
2a0c:bdc0:1000:1::b93a:763ns02.i-domini.it | NS | ✓ | ✓ | ? | ? | - | ✓ | ✓ | ? | ? | - | ✓ | ✓ | ? | ? | - |
2a0c:bdc0:1001:2::c224:4bcesmtp.arcolink.it | drv | ✓ | ✓ | open | ? | ✓ | ✓ | ✓ | open | refused | ✓ | ✓ | ✓ | open | refused | ✓ |
2a0c:bdc0:1001::c224:4b32ns01.i-domini.it | NS | ✓ | ✓ | ? | ? | - | ✓ | ✓ | ? | ? | - | ✓ | ✓ | ? | ? | - |
2a0c:bdc0:1001::c224:4b3emailshield.cloud-email.it | MX | ✓ | ✓ | open | ? | - | ✓ | ✓ | open | ? | - | ✓ | ✓ | open | ? | - |
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 2017-11-30. IPv6 LAN: 2001:7f8:b:100:1d1:a5d5:1333:12. Locations: -.
RPKI & ASPA
3 of 3 prefix(es) covered by a valid ROA.
| Prefix | RPKI state | Reason | Covering VRP(s) |
|---|---|---|---|
2a02:6120::/29 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS51333 /29 maxLen 29 (ripe) |
2a0c:bdc0::/29 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS51333 /29 maxLen 29 (ripe) |
2a0a:bfc0::/29 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS51333 /29 maxLen 29 (ripe) |
Random-IP probe (yarrp) into the AS' prefixes
We probed 30 arbitrary IPv6 address(es) inside AS51333's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:7f8:c5::a505:1333:1 at hop 8 - that router does not answer ICMPv6 Echo. This is not in AS51333'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 honored. Forged ICMPv6 PTB (MTU=1280) was accepted by the destination's stack: the next 1500-byte Echo Reply arrived split into 2 fragments via the IPv6 Fragment Header.
method: ICMPv6 Echo + forged PTB, tested 2026-05-30T12:47:21Z
From NL host (go6lab) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | 2a00:8642:42::3 | 1.3ms | 0% | AS203993 | STEFFANN-DC-AS - S.J.M. Steffann, NL |
| 2 | * | - | 0%* | - | |
| 3 | 2a00:1ca8:1::194 | 2.4ms | 0% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 4 | 2a03:3f40::10:33 | 5.6ms | 0% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 5 | 2001:7f8:13::a505:1333:1 | 20.9ms | 0% | - | NA |
| 6 | 2a0c:bdc0:aaaa:4::2 | 21.0ms | 0% | AS51333 | ARCOLINK-ASN - Arcolink Telecomunicazioni S.r.l., IT |
| 7 | * | - | 0% | - | |
| 8 | * | - | - | - | |
| 9 | * | - | - | - | |
| 10 | * | - | - | - | |
| 11 | * | - | - | - | |
| 12 | * | - | - | - | |
| 13 | * | - | - | - | |
| 14 | * | - | - | - | |
| 15 | * | - | - | - | |
| 16 | * | - | - | - | |
| 17 | * | - | - | - | |
| 18 | * | - | - | - | |
| 19 | * | - | - | - | |
| 20 | * | - | - | - | |
| 21 | * | - | - | - | |
| 22 | * | - | - | - | |
| 23 | * | - | - | - | |
| 24 | * | - | - | - |
tracepath -6
1?: [LOCALHOST] 0.029ms pmtu 1500
1: 2a00:8642:42::3 2.035ms
1: 2a00:8642:42::3 1.745ms
2: gw.friends.steffann.nl 2.916ms
3: 2a00:1ca8:1::194 3.180ms
4: 2a03:3f40::10:33 5.925ms
5: 2001:7f8:13::a505:1333:1 23.554ms asymm 6
6: 2a0c:bdc0:aaaa:4::2 20.580ms asymm 7
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 ITA host (Karsolink) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | * | - | 0%* | - | |
| 2 | * | - | 0%* | - | |
| 3 | 2a12:d8c0:101f:6::1 | 10.0ms | 0% | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 4 | arcolink.minap.it 2001:7f8:c5::a505:1333:1 | 10.6ms | 0% | AS51333 | Arcolink Telecomunicazioni s.r.l. |
| 5 | 2a0c:bdc0:aaaa:4::2 | 10.3ms | 0% | AS51333 | ARCOLINK-ASN - Arcolink Telecomunicazioni S.r.l., IT |
| 6 | * | - | 0% | - | |
| 7 | * | - | - | - | |
| 8 | * | - | - | - | |
| 9 | * | - | - | - | |
| 10 | * | - | - | - | |
| 11 | * | - | - | - | |
| 12 | * | - | - | - | |
| 13 | * | - | - | - | |
| 14 | * | - | - | - | |
| 15 | * | - | - | - | |
| 16 | * | - | - | - | |
| 17 | * | - | - | - | |
| 18 | * | - | - | - | |
| 19 | * | - | - | - | |
| 20 | * | - | - | - | |
| 21 | * | - | - | - | |
| 22 | * | - | - | - | |
| 23 | * | - | - | - | |
| 24 | * | - | - | - |
tracepath -6
1?: [LOCALHOST] 0.027ms pmtu 1500
1: karsolink-01.net.karsolink.com 0.761ms
1: karsolink-01.net.karsolink.com 0.654ms
2: 2a12:d8c0:109f:121::a1 0.801ms
3: 2a12:d8c0:101f:6::1 10.388ms
4: arcolink.minap.it 11.118ms
5: 2a0c:bdc0:aaaa:4::2 10.559ms
6: no reply
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) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | fw1-lju.6connect.com 2607:fae0:a000::2 | 0.2ms | 0%* | AS8038 | 6CONNECT - 6connect, Inc., US |
| 2 | * | - | 0%* | - | |
| 3 | 2a03:a100:0:201:1::1 | 0.9ms | 60% | AS56635 | XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI |
| 4 | e0-1.core1.lju1.he.net 2001:470:1:5be::1 | 2.2ms | 60% | 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 | arcolink.minap.it 2001:7f8:c5::a505:1333:1 | 13.4ms | 0% | AS51333 | Arcolink Telecomunicazioni s.r.l. |
| 9 | 2a0c:bdc0:aaaa:4::2 | 12.2ms | 0% | AS51333 | ARCOLINK-ASN - Arcolink Telecomunicazioni S.r.l., IT |
| 10 | * | - | 0% | - | |
| 11 | * | - | - | - | |
| 12 | * | - | - | - | |
| 13 | * | - | - | - | |
| 14 | * | - | - | - | |
| 15 | * | - | - | - | |
| 16 | * | - | - | - | |
| 17 | * | - | - | - | |
| 18 | * | - | - | - | |
| 19 | * | - | - | - | |
| 20 | * | - | - | - | |
| 21 | * | - | - | - | |
| 22 | * | - | - | - | |
| 23 | * | - | - | - | |
| 24 | * | - | - | - |
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] 0.025ms pmtu 1500
1: fw1-lju.6connect.com 0.660ms
1: fw1-lju.6connect.com 0.516ms
2: ccr-to-fw-ccr1-gw-lju.6connect.com 0.699ms
3: no reply
4: e0-1.core1.lju1.he.net 2.080ms
5: no reply
6: port-channel1.core1.zag2.he.net 3.649ms
7: no reply
8: arcolink.minap.it 12.721ms
9: 2a0c:bdc0:aaaa:4::2 12.243ms
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