[REN-BGP-stats-all] IPv4 R&E Routing Table Report - CERNET (R&E) view
REN Routing Table Report
cscora at bgp.nsrc.org
Thu Jul 10 20:10:35 UTC 2025
IPv4 R&E Routing Table Report 20:10 GMT Thu 10 Jul, 2025
IPv4 BGP Table (R&E) as seen at CERNET.
Report Website: https://bgp.nsrc.org/REN
Detailed Analysis: https://bgp.nsrc.org/REN/CERNET/
Analysis Summary
----------------
BGP routing table entries examined: 18262
Prefixes after maximum aggregation (per Origin AS): 10434
Deaggregation factor: 1.75
Unique aggregates announced (without unneeded subnets): 11850
Number of IPv4 prefixes with a valid ROA: 7940
Number of IPv4 prefixes with an invalid ROA: 26
Number of IPv4 prefixes with no ROA: 10296
Total ASes present in the Internet Routing Table: 2703
Prefixes per ASN: 6.76
Origin-only ASes present in the Internet Routing Table: 2349
Origin ASes announcing only one prefix: 1041
Transit ASes present in the Internet Routing Table: 354
Transit-only ASes present in the Internet Routing Table: 60
Paths with bogon ASNs present in the IPv4 Routing Table: 0
Average AS path length visible in the Internet Routing Table: 6.1
Max AS path length visible: 19
Max AS path prepend of ASN (395156) 12
Prefixes from unregistered ASNs in the Routing Table: 33
Number of instances of unregistered ASNs: 33
Number of 32-bit ASNs allocated by the RIRs: 46773
Number of 32-bit ASNs visible in the Routing Table: 672
Prefixes from 32-bit ASNs in the Routing Table: 1828
Number of bogon 32-bit ASNs visible in the Routing Table: 0
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 2
Number of addresses announced to Internet: 193967504
Equivalent to 11 /8s, 143 /16s and 181 /24s
Percentage of available address space announced: 5.2
Percentage of allocated address space announced: 5.2
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 99.6
Total number of prefixes smaller than registry allocations: 2273
APNIC Region Analysis Summary
-----------------------------
Prefixes being announced by APNIC Region ASes: 4164
Total APNIC prefixes after maximum aggregation: 2214
APNIC Deaggregation factor: 1.88
Prefixes being announced from the APNIC address blocks: 4163
Unique aggregates announced from the APNIC address blocks: 2638
APNIC Region origin ASes present in the Internet Routing Table: 586
APNIC Prefixes per ASN: 7.10
APNIC Region origin ASes announcing only one prefix: 250
APNIC Region transit ASes present in the Internet Routing Table: 47
Average APNIC Region AS path length visible: 4.8
Max APNIC Region AS path length visible: 15
Number of APNIC region 32-bit ASNs visible in the Routing Table: 240
Number of APNIC addresses announced to Internet: 43826688
Equivalent to 2 /8s, 156 /16s and 190 /24s
APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431
(pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079, 55296-56319,
58368-59391, 63488-64098, 64297-64395, 131072-155961
APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8,
49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8,
106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8,
116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8,
123/8, 124/8, 125/8, 126/8, 133/8, 150/8, 153/8,
163/8, 171/8, 175/8, 180/8, 182/8, 183/8, 202/8,
203/8, 210/8, 211/8, 218/8, 219/8, 220/8, 221/8,
222/8, 223/8,
ARIN Region Analysis Summary
----------------------------
Prefixes being announced by ARIN Region ASes: 8079
Total ARIN prefixes after maximum aggregation: 4500
ARIN Deaggregation factor: 1.80
Prefixes being announced from the ARIN address blocks: 8129
Unique aggregates announced from the ARIN address blocks: 4952
ARIN Region origin ASes present in the Internet Routing Table: 1251
ARIN Prefixes per ASN: 6.50
ARIN Region origin ASes announcing only one prefix: 442
ARIN Region transit ASes present in the Internet Routing Table: 156
Average ARIN Region AS path length visible: 7.3
Max ARIN Region AS path length visible: 19
Number of ARIN region 32-bit ASNs visible in the Routing Table: 214
Number of ARIN addresses announced to Internet: 85900800
Equivalent to 5 /8s, 30 /16s and 190 /24s
ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106
(pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153
3354-4607, 4865-5119, 5632-6655, 6912-7466
7723-8191, 10240-12287, 13312-15359, 16384-17407
18432-20479, 21504-23551, 25600-26591,
26624-27647, 29696-30719, 31744-33791
35840-36863, 39936-40959, 46080-47103
53248-55295, 62464-63487, 64198-64296, 393216-402332
ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8,
12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8,
20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8,
29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8,
40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8,
54/8, 55/8, 56/8, 63/8, 64/8, 65/8, 66/8,
67/8, 68/8, 69/8, 70/8, 71/8, 72/8, 73/8,
74/8, 75/8, 76/8, 96/8, 97/8, 98/8, 99/8,
100/8, 104/8, 107/8, 108/8, 128/8, 129/8, 130/8,
131/8, 132/8, 134/8, 135/8, 136/8, 137/8, 138/8,
139/8, 140/8, 142/8, 143/8, 144/8, 146/8, 147/8,
148/8, 149/8, 152/8, 155/8, 156/8, 157/8, 158/8,
159/8, 160/8, 161/8, 162/8, 164/8, 165/8, 166/8,
167/8, 168/8, 169/8, 170/8, 172/8, 173/8, 174/8,
184/8, 192/8, 198/8, 199/8, 204/8, 205/8, 206/8,
207/8, 208/8, 209/8, 214/8, 215/8, 216/8,
RIPE Region Analysis Summary
----------------------------
Prefixes being announced by RIPE Region ASes: 3622
Total RIPE prefixes after maximum aggregation: 2888
RIPE Deaggregation factor: 1.25
Prefixes being announced from the RIPE address blocks: 3607
Unique aggregates announced from the RIPE address blocks: 2921
RIPE Region origin ASes present in the Internet Routing Table: 650
RIPE Prefixes per ASN: 5.55
RIPE Region origin ASes announcing only one prefix: 283
RIPE Region transit ASes present in the Internet Routing Table: 105
Average RIPE Region AS path length visible: 4.3
Max RIPE Region AS path length visible: 14
Number of RIPE region 32-bit ASNs visible in the Routing Table: 150
Number of RIPE addresses announced to Internet: 58034832
Equivalent to 3 /8s, 117 /16s and 138 /24s
RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614
(pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631
6656-6911, 8192-9215, 12288-13311, 15360-16383
20480-21503, 24576-25599, 28672-29695
30720-31743, 33792-35839, 38912-39935
40960-45055, 47104-52223, 56320-58367
59392-61439, 61952-62463, 64396-64495
196608-216475
RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8,
53/8, 57/8, 62/8, 77/8, 78/8, 79/8, 80/8,
81/8, 82/8, 83/8, 84/8, 85/8, 86/8, 87/8,
88/8, 89/8, 90/8, 91/8, 92/8, 93/8, 94/8,
95/8, 109/8, 141/8, 145/8, 151/8, 176/8, 178/8,
185/8, 188/8, 193/8, 194/8, 195/8, 212/8, 213/8,
217/8,
LACNIC Region Analysis Summary
------------------------------
Prefixes being announced by LACNIC Region ASes: 1276
Total LACNIC prefixes after maximum aggregation: 493
LACNIC Deaggregation factor: 2.59
Prefixes being announced from the LACNIC address blocks: 1273
Unique aggregates announced from the LACNIC address blocks: 678
LACNIC Region origin ASes present in the Internet Routing Table: 132
LACNIC Prefixes per ASN: 9.64
LACNIC Region origin ASes announcing only one prefix: 56
LACNIC Region transit ASes present in the Internet Routing Table: 24
Average LACNIC Region AS path length visible: 8.0
Max LACNIC Region AS path length visible: 17
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 60
Number of LACNIC addresses announced to Internet: 4075520
Equivalent to 0 /8s, 62 /16s and 48 /24s
LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247,
61440-61951, 64099-64197, 262144-274844 + ERX transfers
LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8,
191/8, 200/8, 201/8,
AfriNIC Region Analysis Summary
-------------------------------
Prefixes being announced by AfriNIC Region ASes: 1088
Total AfriNIC prefixes after maximum aggregation: 334
AfriNIC Deaggregation factor: 3.26
Prefixes being announced from the AfriNIC address blocks: 1088
Unique aggregates announced from the AfriNIC address blocks: 659
AfriNIC Region origin ASes present in the Internet Routing Table: 22
AfriNIC Prefixes per ASN: 49.45
AfriNIC Region origin ASes announcing only one prefix: 10
AfriNIC Region transit ASes present in the Internet Routing Table: 6
Average AfriNIC Region AS path length visible: 6.1
Max AfriNIC Region AS path length visible: 9
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 8
Number of AfriNIC addresses announced to Internet: 2129152
Equivalent to 0 /8s, 32 /16s and 125 /24s
AfriNIC AS Blocks 36864-37887, 327680-329727 & ERX transfers
AfriNIC Address Blocks 41/8, 102/8, 105/8, 154/8, 196/8, 197/8,
APNIC Region per AS prefix count summary
----------------------------------------
ASN No of nets /20 equiv MaxAgg Description
2907 601 2169 462 SINET-AS Research Organization of Informa
1237 194 74 146 KREONET-AS-KR KISTI, KR
58647 182 18 2 KAGAWAU-AS Kagawa University, JP
7575 172 281 116 AARNET-AS-AP Australian Academic and Rese
55824 148 19 21 NKN-CORE-NW NKN Core Network, IN
4538 114 4176 70 ERX-CERNET-BKB China Education and Resear
4762 75 4 1 MAHIDOL-BORDER-AS Mahidol University, Tha
4621 66 37 9 UNINET-AS-AP UNINET-, TH
6262 63 134 56 CSIRO Commonwealth Scientific and Industr
1659 60 1210 34 ERX-TANET-ASN1 Taiwan Academic Network TA
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet-APNIC
ARIN Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
2152 574 491 98 CENIC-2152, US
2920 229 44 49 LACOE, US
376 201 162 151 RISQ-AS, CA
5786 199 16 1 UPRENET, PR
18558 140 18 5 NETBLK-RCOEK, US
81 129 519 34 NCREN, US
23024 99 7 17 OCDE, US
21976 90 34 16 NJEDGE-NET, US
237 86 544 52 MERIT-AS-14, US
1736 79 16 1 MU-AS, US
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet-ARIN
RIPE Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
680 284 1899 250 DFN Verein zur Foerderung eines Deutschen
786 193 1742 187 JANET Jisc Services Limited, GB
559 114 533 104 SWITCH Peering requests: peering at switch.c
8895 109 24 5 ISU Internet Services Unit ISU, SA
1103 99 1759 85 SURFNET-NL SURFnet, The Netherlands, NL
2614 92 26 69 ROEDUNET, RO
137 82 677 77 ASGARR Consortium GARR, IT
3267 80 29 69 NIKS, RU
1930 79 88 74 RCCN Fundacao para a Ciencia e a Tecnolog
553 75 366 75 BELWUE BelWue-Koordination, DE
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet-RIPE
LACNIC Region per AS prefix count summary
-----------------------------------------
ASN No of nets /20 equiv MaxAgg Description
1916 231 177 41 Rede Nacional de Ensino e Pesquisa, BR
28391 159 10 71 Universidad Juarez Autonoma de Tabasco, M
11340 110 25 52 Red Universitaria Nacional, CL
271640 68 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR
2715 55 100 37 Fundacao Carlos Chagas Filho de Amparo a
61468 52 3 21 CEDIA, EC
19611 48 17 2 Associacao Antonio Vieira - Unisinos, BR
28614 38 2 2 Fundacao Universidade Regional de Blumena
1251 37 31 26 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S
3596 37 8 4 Universidad Autonoma Metropolitana, MX
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet-LACNIC
AfriNIC Region per AS prefix count summary
------------------------------------------
ASN No of nets /20 equiv MaxAgg Description
36914 567 57 206 KENET-AS, KE
2018 374 318 69 TENET-1, ZA
8094 47 48 18 PUKNET, ZA
37215 37 8 1 MAREN, MW
37501 11 49 6 UOFS, ZA
327700 11 16 1 MoRENet, MZ
37654 10 1 6 RwEdNet-AS, RW
36982 8 33 8 UCT, ZA
327798 4 0 3 BERNET, BI
329522 4 1 2 SANSA, ZA
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet-AFRINIC
Global Per AS prefix count summary
----------------------------------
ASN No of nets /20 equiv MaxAgg Description
2907 601 2169 462 SINET-AS Research Organization of Informa
2152 574 491 98 CENIC-2152, US
36914 567 57 206 KENET-AS, KE
2018 374 318 69 TENET-1, ZA
680 284 1899 250 DFN Verein zur Foerderung eines Deutschen
1916 231 177 41 Rede Nacional de Ensino e Pesquisa, BR
2920 229 44 49 LACOE, US
376 201 162 151 RISQ-AS, CA
5786 199 16 1 UPRENET, PR
1237 194 74 146 KREONET-AS-KR KISTI, KR
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet
Global Per AS Maximum Aggregation summary
-----------------------------------------
ASN No of nets Net Savings Description
2152 574 476 CENIC-2152, US
36914 567 361 KENET-AS, KE
2018 374 305 TENET-1, ZA
5786 199 198 UPRENET, PR
1916 231 190 Rede Nacional de Ensino e Pesquisa, BR
2920 229 180 LACOE, US
58647 182 180 KAGAWAU-AS Kagawa University, JP
18558 140 135 NETBLK-RCOEK, US
55824 148 127 NKN-CORE-NW NKN Core Network, IN
8895 109 104 ISU Internet Services Unit ISU, SA
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-CIDRnet
List of Unregistered Origin ASNs (Global)
-----------------------------------------
Bad AS Designation Net Originated Transit AS Transit AS Name
26971 UNALLOCATED 129.111.0.0/16 276 OTS-AS-276, US
26898 UNALLOCATED 131.187.248.0/22 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.248.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.249.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.250.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.251.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 198.30.187.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.80.0/20 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.80.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.81.0/24 3112 OARNET-AS-1, US
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-badAS
Advertised Unallocated Addresses
--------------------------------
Unassigned Network ASN Information AS Name
202.14.117.0/24 Origin: 17827 STOU-AS-TH Sukhothai Thammathirat Open U
202.14.117.0/24 Transit: 4621 UNINET-AS-AP UNINET-, TH
203.9.156.0/24 Origin: 1851 ADELAIDE-UNIVERSITY-AS-AP The University
203.9.156.0/24 Transit: 7575 AARNET-AS-AP Australian Academic and Res
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-add-IANA
Number of prefixes announced per prefix length (Global)
-------------------------------------------------------
/1:0 /2:0 /3:0 /4:0 /5:0 /6:0
/7:0 /8:0 /9:1 /10:1 /11:1 /12:10
/13:19 /14:32 /15:110 /16:1926 /17:409 /18:453
/19:550 /20:777 /21:791 /22:1370 /23:1453 /24:10351
/25:4 /26:2 /27:0 /28:1 /29:0 /30:0
/31:1 /32:0
Advertised prefixes smaller than registry allocations
-----------------------------------------------------
ASN No of nets Total ann. Description
36914 547 567 KENET-AS, KE
8895 106 109 ISU Internet Services Unit ISU, SA
2152 66 574 CENIC-2152, US
23024 38 99 OCDE, US
200521 36 61 SEAP-AGE, ES
3267 35 80 NIKS, RU
28614 32 38 Fundacao Universidade Regional de Blumenau, BR
46115 32 35 LUTHER, US
37215 31 37 MAREN, MW
25977 30 44 HCCS, US
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-sXXas-nos
Number of /24s announced per /8 block (Global)
----------------------------------------------
1:2 5:16 8:2 12:2 14:93 23:9
24:3 31:1 35:9 37:14 38:11 40:1
41:222 42:5 44:5 45:46 46:5 47:1
49:10 50:2 52:1 59:18 61:3 62:8
63:32 64:43 65:5 66:44 67:39 68:13
69:14 70:2 71:1 72:8 74:54 76:15
77:9 78:3 79:5 80:13 81:27 82:6
83:8 84:7 85:51 86:6 87:1 89:10
91:40 92:2 93:14 94:2 95:1 96:5
97:1 98:2 102:2 103:360 104:72 108:8
109:6 111:20 113:1 114:21 116:9 117:61
118:33 119:8 121:18 122:8 123:8 125:5
128:55 129:45 130:97 131:64 132:68 133:156
134:109 136:200 137:106 138:10 139:5 140:31
141:4 142:26 143:26 144:32 145:2 146:136
147:52 148:200 149:10 150:37 151:10 152:140
153:15 154:40 155:85 156:126 157:25 158:25
159:19 160:34 161:17 162:21 163:75 164:10
165:43 167:28 168:96 169:6 170:17 171:1
172:1 173:6 175:16 177:5 179:12 180:15
181:1 182:12 184:3 185:50 186:4 187:25
188:16 190:17 191:13 192:1382 193:293 194:142
195:54 196:145 197:357 198:513 199:242 200:295
201:39 202:569 203:436 204:390 205:178 206:202
207:312 208:64 209:166 210:141 211:3 212:151
213:4 216:94 217:20 218:23 219:7 220:16
222:1
End of report
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